diff --git a/packages/frontend/src/components/MkDriveFileSelectDialog.vue b/packages/frontend/src/components/MkDriveFileSelectDialog.vue
index 50b68b3d0f..698a71e70c 100644
--- a/packages/frontend/src/components/MkDriveFileSelectDialog.vue
+++ b/packages/frontend/src/components/MkDriveFileSelectDialog.vue
@@ -29,6 +29,7 @@ import * as Misskey from 'misskey-js';
 import MkDrive from '@/components/MkDrive.vue';
 import MkModalWindow from '@/components/MkModalWindow.vue';
 import { i18n } from '@/i18n.js';
+import { deepClone } from '@/utility/clone.js';
 
 withDefaults(defineProps<{
 	initialFolder?: Misskey.entities.DriveFolder['id'] | null;
@@ -46,7 +47,7 @@ const dialog = useTemplateRef('dialog');
 const selected = ref<Misskey.entities.DriveFile[]>([]);
 
 function ok() {
-	emit('done', selected.value);
+	emit('done', deepClone(selected.value)); // selected.valueをそのまま渡すと純粋なオブジェクトではなくProxyが渡されてしまい、シチュエーションによってはそれによって不具合の原因になる(workerにpostMessageで渡せないなど)
 	dialog.value?.close();
 }
 
diff --git a/packages/frontend/src/pages/room.add-object-dialog.vue b/packages/frontend/src/pages/room.add-object-dialog.vue
index 76c3c34f73..832a2b62c3 100644
--- a/packages/frontend/src/pages/room.add-object-dialog.vue
+++ b/packages/frontend/src/pages/room.add-object-dialog.vue
@@ -54,7 +54,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						:leaveToClass="prefer.s.animation ? $style.transition_options_leaveTo : ''"
 					>
 						<div v-if="selectedObjectDef != null && selectedInstanceId != null && showObjectOptions" :class="$style.customize" class="_panel _shadow">
-							<XObjectCustomizeForm :schema="selectedObjectDef.options.schema" :options="selectedObjectOptionsState" @update="(k, v) => updateObjectOption(k, v)"></XObjectCustomizeForm>
+							<XObjectCustomizeForm :addFileAttachment="addFileAttachment" :schema="selectedObjectDef.options.schema" :options="selectedObjectOptionsState" @update="(k, v) => updateObjectOption(k, v)"></XObjectCustomizeForm>
 						</div>
 					</Transition>
 				</div>
@@ -66,10 +66,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script setup lang="ts">
 import { ref, useTemplateRef, watch, onMounted, onUnmounted, reactive, nextTick, shallowRef, computed, triggerRef, markRaw } from 'vue';
+import * as Misskey from 'misskey-js';
 import XObjectCustomizeForm from './room.object-customize-form.vue';
 import XItem from './room.add-object-dialog.item.vue';
-import type { RoomObjectInstance, RoomStateObject } from '@/world/room/object.js';
+import type { RawOptions, RoomObjectInstance, RoomStateObject } from '@/world/room/object.js';
 import type { PreviewEngineControllerOptions } from '@/world/room/previewEngineController.js';
+import type { RoomAttachments } from '@/world/room/utility.js';
 import { i18n } from '@/i18n.js';
 import MkModalWindow from '@/components/MkModalWindow.vue';
 import * as os from '@/os.js';
@@ -93,6 +95,7 @@ const emit = defineEmits<{
 	(ev: 'ok', ctx: {
 		id: string;
 		options: any;
+		attachments: RoomAttachments;
 	}): void;
 	(ev: 'cancel'): void;
 	(ev: 'closed'): void;
@@ -103,11 +106,19 @@ const canvas = useTemplateRef('canvas');
 const selectedId = ref<string | null>(null);
 const showPreview = ref(false);
 const selectedInstanceId = ref<string | null>(null);
-const selectedObjectOptionsState = ref<RoomStateObject | null>(null);
+const selectedObjectOptionsState = ref<RawOptions | null>(null);
 const selectedObjectDef = computed(() => OBJECT_DEFS.find(def => def.id === selectedId.value) ?? null);
 const showObjectOptions = ref(false);
 const searchKeyword = ref('');
 
+const attachments = {
+	files: [],
+} as RoomAttachments;
+
+function addFileAttachment(file: Misskey.entities.DriveFile) {
+	attachments.files.push(file);
+}
+
 const previewEngineControllerOptions = computed<PreviewEngineControllerOptions>(() => ({
 	graphicsQuality: props.graphicsQuality,
 	fps: null,
@@ -179,7 +190,7 @@ watch(selectedId, (newId) => {
 });
 
 function updateObjectOption(k: string, v: any) {
-	controller.updateObjectOption(k, v);
+	controller.updateObjectOption(k, v, attachments);
 	selectedObjectOptionsState.value![k] = v;
 }
 
@@ -195,6 +206,7 @@ function ok() {
 	emit('ok', {
 		id: selectedId.value,
 		options: deepClone(selectedObjectOptionsState.value),
+		attachments: deepClone(attachments),
 	});
 
 	dialog.value?.close();
diff --git a/packages/frontend/src/pages/room.object-customize-form.vue b/packages/frontend/src/pages/room.object-customize-form.vue
index c6d8765d8b..97a64dbe76 100644
--- a/packages/frontend/src/pages/room.object-customize-form.vue
+++ b/packages/frontend/src/pages/room.object-customize-form.vue
@@ -25,7 +25,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkRange :continuousUpdate="true" :min="s.min" :max="s.max" :step="s.step" :modelValue="options[k]" @update:modelValue="v => emit('update', k, v)"></MkRange>
 			</div>
 			<div v-else-if="s.type === 'image'">
-				<MkInput type="text" :modelValue="options[k]" @update:modelValue="v => emit('update', k, v)"></MkInput>
+				<MkButton primary inline @click="changeImage(k)">Change</MkButton>
+				<MkButton v-if="options[k] != null" danger inline iconOnly @click="clearImage(k)"><i class="ti ti-x"></i></MkButton>
 			</div>
 			<div v-else-if="s.type === 'seed'">
 				<MkRange :continuousUpdate="true" :min="0" :max="1000" :step="1" :modelValue="options[k]" @update:modelValue="v => emit('update', k, v)"></MkRange>
@@ -37,6 +38,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { computed, defineAsyncComponent, nextTick, onMounted, onUnmounted, ref, shallowRef, useTemplateRef, watch } from 'vue';
+import * as Misskey from 'misskey-js';
 import type { ObjectDef } from '@/world/room/object.js';
 import { i18n } from '@/i18n.js';
 import MkButton from '@/components/MkButton.vue';
@@ -46,15 +48,44 @@ import MkInput from '@/components/MkInput.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import MkRange from '@/components/MkRange.vue';
 import { getHex, getRgb } from '@/world/utility.js';
+import { chooseDriveFile } from '@/utility/drive.js';
 
 const props = defineProps<{
 	schema: ObjectDef['options']['schema'];
 	options: any;
+	addFileAttachment: ((file: Misskey.entities.DriveFile) => void);
 }>();
 
 const emit = defineEmits<{
 	(ev: 'update', k: string, v: any): void;
 }>();
+
+async function changeImage(k: string) {
+	chooseDriveFile({ multiple: false }).then((fileResponse) => {
+		if (fileResponse.length === 0) return;
+		const file = fileResponse[0];
+		if (!file.type.startsWith('image/')) {
+			os.alert({
+				type: 'error',
+				text: 'The selected file is not an image.',
+			});
+			return;
+		}
+		if (file.size > 1024 * 1024 * 5) {
+			os.alert({
+				type: 'error',
+				text: 'The file size exceeds the limit of 5MB.',
+			});
+			return;
+		}
+		props.addFileAttachment(file);
+		emit('update', k, file.id);
+	});
+}
+
+function clearImage(k: string) {
+	emit('update', k, null);
+}
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend/src/pages/room.vue b/packages/frontend/src/pages/room.vue
index 7ef5001243..a2d22a4c6f 100644
--- a/packages/frontend/src/pages/room.vue
+++ b/packages/frontend/src/pages/room.vue
@@ -6,7 +6,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <template>
 <div :class="$style.root">
 	<div :class="[$style.screen, { [$style.zen]: false }]">
-		<canvas ref="canvas" :class="$style.canvas" tabindex="-1" :style="{ visibility: controller.isReady.value ? 'visible' : 'hidden' }"></canvas>
+		<canvas ref="canvas" :class="$style.canvas" tabindex="-1"></canvas>
 
 		<Transition
 			:enterActiveClass="$style.transition_fade_enterActive"
@@ -71,7 +71,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div v-if="controller.isReady.value && controller.isEditMode.value && controller.selected.value != null && selectedObjectDef != null && !controller.grabbing.value" :key="controller.selected.value.objectId" class="_panel" :class="$style.overlayObjectInfoPanel">
 			{{ selectedObjectDef.name }}
 
-			<XObjectCustomizeForm :schema="selectedObjectDef.options.schema" :options="controller.selected.value.objectState.options" @update="(k, v) => controller.updateObjectOption(controller.selected.value.objectId, k, v)"></XObjectCustomizeForm>
+			<XObjectCustomizeForm :addFileAttachment="addFileAttachment" :schema="selectedObjectDef.options.schema" :options="controller.selected.value.objectState.options" @update="(k, v) => controller.updateObjectOption(controller.selected.value.objectId, k, v, attachments)"></XObjectCustomizeForm>
 		</div>
 
 		<div v-if="isRoomSettingsOpen && controller.isEditMode.value" class="_panel" :class="$style.overlayObjectInfoPanel">
@@ -88,9 +88,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { computed, defineAsyncComponent, markRaw, nextTick, onMounted, onUnmounted, ref, shallowRef, useTemplateRef, watch } from 'vue';
 import * as BABYLON from '@babylonjs/core';
+import * as Misskey from 'misskey-js';
 import XObjectCustomizeForm from './room.object-customize-form.vue';
 import XEnvOptions from './room.env-options.vue';
 import type { RoomControllerOptions } from '@/world/room/controller.js';
+import type { RoomAttachments } from '@/world/room/utility.js';
 import { definePage } from '@/page.js';
 import { i18n } from '@/i18n.js';
 import { ensureSignin } from '@/i';
@@ -258,6 +260,14 @@ console.log('installedObjects:', data.installedObjects.length);
 
 let latestData = deepClone(data);
 
+const attachments = {
+	files: [],
+} as RoomAttachments;
+
+function addFileAttachment(file: Misskey.entities.DriveFile) {
+	attachments.files.push(file);
+}
+
 const roomControllerOptions = computed<RoomControllerOptions>(() => ({
 	graphicsQuality: graphicsQuality.value,
 	fps: fps.value,
@@ -282,7 +292,7 @@ onMounted(async () => {
 	}
 
 	try {
-		await controller.init(canvas.value!);
+		await controller.init(canvas.value!, attachments);
 	} catch (err) {
 		console.error(err);
 		os.alert({
@@ -457,7 +467,8 @@ async function addObject(ev: PointerEvent) {
 		graphicsQuality: graphicsQuality.value,
 	}, {
 		ok: async (res) => {
-			controller.addObject(res.id, res.options);
+			attachments.files.push(...res.attachments.files); // TODO: mergeAttachmentsみたいな関数を実装して使う
+			controller.addObject(res.id, res.options, attachments);
 			canvas.value!.focus();
 		},
 		closed: () => {
diff --git a/packages/frontend/src/world/room/controller.ts b/packages/frontend/src/world/room/controller.ts
index 71e52f81f7..d2734a9a27 100644
--- a/packages/frontend/src/world/room/controller.ts
+++ b/packages/frontend/src/world/room/controller.ts
@@ -9,8 +9,10 @@ import { EngineControllerBase } from '../engineControllerBase.js';
 import type { ShallowRef } from 'vue';
 import type { RoomState } from './engine.js';
 import type { RoomStateObject } from './object.js';
+import type { RoomAttachments } from './utility.js';
 import * as sound from '@/utility/sound.js';
 import { deepEqual } from '@/utility/deep-equal.js';
+import { deepClone } from '@/utility/clone.js';
 
 export type RoomControllerOptions = {
 	workerMode?: boolean;
@@ -39,18 +41,18 @@ export class RoomController extends EngineControllerBase {
 		this.roomState = shallowRef(roomState);
 	}
 
-	public async init(canvas: HTMLCanvasElement) {
+	public async init(canvas: HTMLCanvasElement, attachments: RoomAttachments) {
 		const { engineEvents } = await this._init_(canvas, {
 			createWorker: (offscreen) => new Promise((resolve) => {
 				import('./worker?worker').then(({ default: RoomWorker }) => {
 					const worker = new RoomWorker();
-					worker.postMessage({ type: 'init', canvas: offscreen, options: this.options, roomState: this.roomState.value }, [offscreen]);
+					worker.postMessage({ type: 'init', canvas: offscreen, options: this.options, roomState: this.roomState.value, roomAttachments: attachments }, [offscreen]);
 					resolve(worker);
 				});
 			}),
 			createEngine: (babylonEngine) => new Promise((resolve) => {
 				import('./engine.js').then(({ RoomEngine }) => {
-					resolve(new RoomEngine(this.roomState.value, {
+					resolve(new RoomEngine(this.roomState.value, attachments, {
 						engine: babylonEngine,
 						...this.options,
 					}));
@@ -138,8 +140,8 @@ export class RoomController extends EngineControllerBase {
 		this.set('gridSnapping', gridSnapping);
 	}
 
-	public updateObjectOption(objectId: string, key: string, value: any) {
-		this.call('updateObjectOption', [objectId, key, value]);
+	public updateObjectOption(objectId: string, key: string, value: any, attachments?: RoomAttachments) {
+		this.call('updateObjectOption', deepClone([objectId, key, value, attachments])); // 場合によってはvueによって(postMessage不能な)proxy化された値が来ることも考えられるのでdeepClone
 	}
 
 	public changeEnvType(type: RoomState['env']['type']) {
@@ -162,8 +164,8 @@ export class RoomController extends EngineControllerBase {
 		this.call('removeSelectedObject');
 	}
 
-	public addObject(type: string, options: any) {
-		this.call('addObject', [type, options]);
+	public addObject(type: string, options: any, attachments?: RoomAttachments) {
+		this.call('addObject', deepClone([type, options, attachments])); // 場合によってはvueによって(postMessage不能な)proxy化された値が来ることも考えられるのでdeepClone
 	}
 
 	public endGrabbing() {
diff --git a/packages/frontend/src/world/room/engine.ts b/packages/frontend/src/world/room/engine.ts
index fb3d697129..2e7d4872ad 100644
--- a/packages/frontend/src/world/room/engine.ts
+++ b/packages/frontend/src/world/room/engine.ts
@@ -17,9 +17,11 @@ import { TIME_MAP, scaleMorph, camelToKebab, cm, WORLD_SCALE, getMeshesBoundingB
 import { getObjectDef } from './object-defs.js';
 import { findMaterial, GRAPHICS_QUALITY, ModelManager, SYSTEM_HEYA_MESH_NAMES, SYSTEM_MESH_NAMES } from './utility.js';
 import { JapaneseEnvManager, MuseumEnvManager, SimpleEnvManager } from './env.js';
+import { convertRawOptions } from './object.js';
+import type { RoomAttachments } from './utility.js';
+import type { ConvertedOptions, ObjectDef, RoomObjectInstance, RoomStateObject } from './object.js';
 import type { GridMaterial } from '@babylonjs/materials';
 import type { EnvManager, JapaneseEnvOptions, SimpleEnvOptions } from './env.js';
-import type { ObjectDef, RoomObjectInstance, RoomStateObject } from './object.js';
 import { genId } from '@/utility/id.js';
 import { deepClone } from '@/utility/clone.js';
 
@@ -36,7 +38,7 @@ export type RoomState = {
 		options: JapaneseEnvOptions;
 	};
 	roomLightColor: [number, number, number];
-	installedObjects: RoomStateObject<any>[];
+	installedObjects: RoomStateObject[];
 	worldScale: number;
 };
 
@@ -97,7 +99,7 @@ export type RoomEngineEvents = {
 	'changeSelectedState': (ctx: {
 		selected: {
 			objectId: string;
-			objectState: RoomStateObject<any>;
+			objectState: RoomStateObject;
 		} | null;
 	}) => void;
 	'changeGrabbingState': (ctx: { grabbing: { forInstall: boolean } | null }) => void;
@@ -123,6 +125,7 @@ export class RoomEngine extends EventEmitter {
 	private fixedCamera: BABYLON.FreeCamera;
 	public objectEntities: Map<string, {
 		rootMesh: BABYLON.Mesh;
+		convertedOptions: ConvertedOptions;
 		instance: RoomObjectInstance;
 		model: ModelManager;
 	}> = new Map();
@@ -156,7 +159,7 @@ export class RoomEngine extends EventEmitter {
 	private _selected: {
 		objectId: string;
 		objectEntity: RoomEngine['objectEntities'] extends Map<string, infer V> ? V : never;
-		objectState: RoomStateObject<any>;
+		objectState: RoomStateObject;
 		objectDef: ObjectDef;
 	} | null = null;
 	get selected() {
@@ -169,6 +172,7 @@ export class RoomEngine extends EventEmitter {
 
 	private time: 0 | 1 | 2 = 0; // 0: 昼, 1: 夕, 2: 夜
 	public roomState: RoomState;
+	public roomAttachments: RoomAttachments;
 
 	private _gridSnapping = { enabled: true, scale: cm(4) };
 	get gridSnapping() {
@@ -213,7 +217,7 @@ export class RoomEngine extends EventEmitter {
 		'pointer': (event: { x: number; y: number; }) => void;
 	}> = new EventEmitter();
 
-	constructor(roomState: RoomState, options: {
+	constructor(roomState: RoomState, roomAttachments: RoomAttachments, options: {
 		engine: BABYLON.WebGPUEngine;
 		graphicsQuality: number;
 		fps: number | null;
@@ -229,6 +233,7 @@ export class RoomEngine extends EventEmitter {
 				options: { ...getObjectDef(o.type).options.default, ...o.options },
 			})),
 		};
+		this.roomAttachments = roomAttachments;
 		this.graphicsQuality = options.graphicsQuality;
 		this.fps = options.fps;
 		this.useGlow = this.graphicsQuality >= GRAPHICS_QUALITY.MEDIUM;
@@ -907,6 +912,8 @@ export class RoomEngine extends EventEmitter {
 			*/
 		});
 
+		const convertedOptions = convertRawOptions(def.options.schema, args.options, this.roomAttachments);
+
 		const objectInstance = await def.createInstance({
 			scene: this.scene,
 			sr: {
@@ -923,7 +930,7 @@ export class RoomEngine extends EventEmitter {
 			},
 			lc: this.lightContainer,
 			root,
-			options: args.options,
+			options: convertedOptions,
 			model,
 			id: args.id,
 			timer: this.timer, // TODO: 家具が撤去された後も動作し続けるのをどうにかする
@@ -960,7 +967,7 @@ export class RoomEngine extends EventEmitter {
 			enableObjectCollision(root.getChildMeshes());
 		}
 
-		this.objectEntities.set(args.id, { instance: objectInstance, rootMesh: root, model });
+		this.objectEntities.set(args.id, { convertedOptions, instance: objectInstance, rootMesh: root, model });
 
 		return { root, objectInstance };
 	}
@@ -1441,9 +1448,14 @@ export class RoomEngine extends EventEmitter {
 		return root;
 	}
 
-	public async addObject(type: string, _options?: any) {
+	public async addObject(type: string, _options?: any, attachments?: RoomAttachments) {
 		if (!this.isEditMode) return;
 		if (this.grabbingCtx != null) return;
+
+		if (attachments != null) {
+			this.roomAttachments = attachments;
+		}
+
 		this.selectObject(null);
 
 		const dir = this.camera.getDirection(BABYLON.Axis.Z).scale(this.scene.useRightHandedSystem ? -1 : 1);
@@ -1683,18 +1695,27 @@ export class RoomEngine extends EventEmitter {
 		this.grabbingCtx.rotation += delta;
 	}
 
-	public updateObjectOption(objectId: string, key: string, value: any) {
-		const options = this.roomState.installedObjects.find(o => o.id === objectId)?.options;
-		if (options == null) return;
-		options[key] = value;
+	public updateObjectOption(objectId: string, key: string, value: any, attachments?: RoomAttachments) {
+		if (attachments != null) {
+			this.roomAttachments = attachments;
+		}
+
+		const o = this.roomState.installedObjects.find(o => o.id === objectId);
+		if (o == null) return;
+
+		const def = getObjectDef(o.type);
+		o.options[key] = value;
 
 		this.ev('changeRoomState', { roomState: this.roomState });
 
 		const entity = this.objectEntities.get(objectId);
 		if (entity == null) return;
 
+		const converted = convertRawOptions(def.options.schema, o.options, this.roomAttachments);
+		entity.convertedOptions[key] = converted[key];
+
 		this.sr.disableSnapshotRendering();
-		entity.instance.onOptionsUpdated?.([key, value]);
+		entity.instance.onOptionsUpdated?.([key, converted[key]]);
 		this.sr.enableSnapshotRendering();
 	}
 
diff --git a/packages/frontend/src/world/room/object.ts b/packages/frontend/src/world/room/object.ts
index 25fba4ecc2..b2d80841f5 100644
--- a/packages/frontend/src/world/room/object.ts
+++ b/packages/frontend/src/world/room/object.ts
@@ -4,17 +4,16 @@
  */
 
 import * as BABYLON from '@babylonjs/core';
-import type { RoomEngine } from './engine.js';
-import type { ModelManager } from './utility.js';
+import type { ModelManager, RoomAttachments } from './utility.js';
 import type { Timer } from '../utility.js';
 
 // babylonのドメイン知識は持たない
-export type RoomStateObject<Options = any> = {
+export type RoomStateObject = {
 	id: string;
 	type: string;
 	position: [number, number, number];
 	rotation: [number, number, number];
-	options: Options;
+	options: RawOptions;
 
 	/**
 	 * 別のオブジェクトのID
@@ -83,7 +82,15 @@ type SeedOptionSchema = {
 
 type OptionsSchema = Record<string, NumberOptionSchema | BooleanOptionSchema | StringOptionSchema | ColorOptionSchema | EnumOptionSchema | RangeOptionSchema | ImageOptionSchema | SeedOptionSchema>;
 
-type GetOptionsSchemaValues<T extends OptionsSchema> = {
+export type RawOptions = Record<string, unknown> & {
+	readonly __brand: unique symbol;
+};
+
+export type ConvertedOptions = Record<string, unknown> & {
+	readonly __brand: unique symbol;
+};
+
+type GetRawOptionsSchemaValues<T extends OptionsSchema> = {
 	[K in keyof T]:
 	T[K] extends NumberOptionSchema ? number :
 	T[K] extends BooleanOptionSchema ? boolean :
@@ -95,6 +102,18 @@ type GetOptionsSchemaValues<T extends OptionsSchema> = {
 	T[K] extends SeedOptionSchema ? number :
 	never;
 };
+type GetConvertedOptionsSchemaValues<T extends OptionsSchema> = {
+	[K in keyof T]:
+	T[K] extends NumberOptionSchema ? number :
+	T[K] extends BooleanOptionSchema ? boolean :
+	T[K] extends StringOptionSchema ? string :
+	T[K] extends ColorOptionSchema ? [number, number, number] :
+	T[K] extends EnumOptionSchema ? T[K]['enum'][number] :
+	T[K] extends RangeOptionSchema ? number :
+	T[K] extends ImageOptionSchema ? { url: string; } | null :
+	T[K] extends SeedOptionSchema ? number :
+	never;
+};
 
 export type ObjectDef<OpSc extends OptionsSchema = OptionsSchema> = {
 	id: string;
@@ -102,7 +121,7 @@ export type ObjectDef<OpSc extends OptionsSchema = OptionsSchema> = {
 	path?: string;
 	options: {
 		schema: OpSc;
-		default: GetOptionsSchemaValues<OpSc>;
+		default: GetRawOptionsSchemaValues<OpSc>;
 	};
 	placement: 'top' | 'side' | 'bottom' | 'wall' | 'ceiling' | 'floor';
 	hasCollisions?: boolean;
@@ -122,13 +141,13 @@ export type ObjectDef<OpSc extends OptionsSchema = OptionsSchema> = {
 		};
 		lc: BABYLON.ClusteredLightContainer | null;
 		root: BABYLON.Mesh;
-		options: Readonly<GetOptionsSchemaValues<OpSc>>;
+		options: Readonly<GetConvertedOptionsSchemaValues<OpSc>>;
 		model: ModelManager;
 		id: string;
 		timer: Timer;
 		graphicsQuality: number;
 		stickyMarkerMeshUpdated?: (mesh: BABYLON.Mesh) => void;
-	}) => RoomObjectInstance<GetOptionsSchemaValues<OpSc>> | Promise<RoomObjectInstance<GetOptionsSchemaValues<OpSc>>>; // TODO: createInstanceをasyncにするのではなく、別にreadyみたいなものを返させる
+	}) => RoomObjectInstance<GetConvertedOptionsSchemaValues<OpSc>> | Promise<RoomObjectInstance<GetConvertedOptionsSchemaValues<OpSc>>>; // TODO: createInstanceをasyncにするのではなく、別にreadyみたいなものを返させる
 };
 
 export function defineObject<const OpSc extends OptionsSchema>(def: ObjectDef<OpSc>): ObjectDef<OpSc> {
@@ -142,3 +161,26 @@ export function defineObjectClass<const OpSc extends OptionsSchema>(baseDef: Par
 		extend: (childDef) => ({ ...baseDef, ...childDef }) as ObjectDef<OpSc>,
 	};
 }
+
+export function convertRawOptions<OpSc extends OptionsSchema>(schema: OpSc, raw: RawOptions, attachments: RoomAttachments): GetConvertedOptionsSchemaValues<OpSc> {
+	const converted = {} as GetConvertedOptionsSchemaValues<OpSc>;
+	for (const record of Object.entries(schema)) {
+		const k = record[0];
+		const v = raw[k];
+		if (record[1].type === 'image' && v != null) {
+			if (v === '') {
+				converted[k] = null;
+				continue;
+			}
+			const file = attachments.files.find(f => f.id === v);
+			if (file != null) {
+				converted[k] = { url: file.url };
+			} else {
+				converted[k] = null;
+			}
+		} else {
+			converted[k] = v;
+		}
+	}
+	return converted;
+}
diff --git a/packages/frontend/src/world/room/objects/allInOnePc.ts b/packages/frontend/src/world/room/objects/allInOnePc.ts
index 50f4848da7..0ddb12d06d 100644
--- a/packages/frontend/src/world/room/objects/allInOnePc.ts
+++ b/packages/frontend/src/world/room/objects/allInOnePc.ts
@@ -97,7 +97,7 @@ export const allInOnePc = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				screenMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					screenMaterial.emissiveColor = new BABYLON.Color3(1, 1, 1);
 					screenMaterial.emissiveTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/clippedPicture.ts b/packages/frontend/src/world/room/objects/clippedPicture.ts
index 10238103ad..5bb184cdfd 100644
--- a/packages/frontend/src/world/room/objects/clippedPicture.ts
+++ b/packages/frontend/src/world/room/objects/clippedPicture.ts
@@ -90,7 +90,7 @@ export const clippedPicture = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				pictureMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					pictureMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					pictureMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/djPlayer.ts b/packages/frontend/src/world/room/objects/djPlayer.ts
index 09994b183c..07cc955505 100644
--- a/packages/frontend/src/world/room/objects/djPlayer.ts
+++ b/packages/frontend/src/world/room/objects/djPlayer.ts
@@ -68,9 +68,9 @@ export const djPlayer = defineObject({
 		applyScreenBrightness();
 
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
-			if (options.customPicture != null && options.customPicture !== '') {
+			if (options.customPicture != null) {
 				screenMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					screenMaterial.emissiveColor = new BABYLON.Color3(1, 1, 1);
 					screenMaterial.emissiveTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/handheldGameConsole.ts b/packages/frontend/src/world/room/objects/handheldGameConsole.ts
index 5f686991e8..bcd622c24d 100644
--- a/packages/frontend/src/world/room/objects/handheldGameConsole.ts
+++ b/packages/frontend/src/world/room/objects/handheldGameConsole.ts
@@ -79,7 +79,7 @@ export const handheldGameConsole = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				screenMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					screenMaterial.emissiveColor = new BABYLON.Color3(1, 1, 1);
 					screenMaterial.emissiveTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/laptopPc.ts b/packages/frontend/src/world/room/objects/laptopPc.ts
index 8bf48e18f4..e936aeeccf 100644
--- a/packages/frontend/src/world/room/objects/laptopPc.ts
+++ b/packages/frontend/src/world/room/objects/laptopPc.ts
@@ -107,7 +107,7 @@ export const laptopPc = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				screenMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					screenMaterial.emissiveColor = new BABYLON.Color3(1, 1, 1);
 					screenMaterial.emissiveTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/largeMousepad.ts b/packages/frontend/src/world/room/objects/largeMousepad.ts
index 142df23a1a..c5dcd92816 100644
--- a/packages/frontend/src/world/room/objects/largeMousepad.ts
+++ b/packages/frontend/src/world/room/objects/largeMousepad.ts
@@ -53,7 +53,7 @@ export const largeMousepad = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				padMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					padMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					padMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/monitor.ts b/packages/frontend/src/world/room/objects/monitor.ts
index db26b9fa22..381746e71f 100644
--- a/packages/frontend/src/world/room/objects/monitor.ts
+++ b/packages/frontend/src/world/room/objects/monitor.ts
@@ -92,7 +92,7 @@ export const monitor = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				screenMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					screenMaterial.emissiveColor = new BABYLON.Color3(1, 1, 1);
 					screenMaterial.emissiveTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/pictureFrame.ts b/packages/frontend/src/world/room/objects/pictureFrame.ts
index 02e4c9ea2a..bf9c28e017 100644
--- a/packages/frontend/src/world/room/objects/pictureFrame.ts
+++ b/packages/frontend/src/world/room/objects/pictureFrame.ts
@@ -175,7 +175,7 @@ export const pictureFrame = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				pictureMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					pictureMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					pictureMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/poster.ts b/packages/frontend/src/world/room/objects/poster.ts
index 2af31148b9..98767aa166 100644
--- a/packages/frontend/src/world/room/objects/poster.ts
+++ b/packages/frontend/src/world/room/objects/poster.ts
@@ -95,7 +95,7 @@ export const poster = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				pictureMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					pictureMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					pictureMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/tabletopFlag.ts b/packages/frontend/src/world/room/objects/tabletopFlag.ts
index cf68a89f42..5441cf6a3f 100644
--- a/packages/frontend/src/world/room/objects/tabletopFlag.ts
+++ b/packages/frontend/src/world/room/objects/tabletopFlag.ts
@@ -54,7 +54,7 @@ export const tabletopFlag = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				flagMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					flagMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					flagMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/tabletopGlassPictureFrame.ts b/packages/frontend/src/world/room/objects/tabletopGlassPictureFrame.ts
index 6add5e83fc..06ff3cf330 100644
--- a/packages/frontend/src/world/room/objects/tabletopGlassPictureFrame.ts
+++ b/packages/frontend/src/world/room/objects/tabletopGlassPictureFrame.ts
@@ -95,7 +95,7 @@ export const tabletopGlassPictureFrame = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				pictureMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					pictureMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					pictureMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/tabletopLcdButtonsController.ts b/packages/frontend/src/world/room/objects/tabletopLcdButtonsController.ts
index d7226a9c0d..e2547fff82 100644
--- a/packages/frontend/src/world/room/objects/tabletopLcdButtonsController.ts
+++ b/packages/frontend/src/world/room/objects/tabletopLcdButtonsController.ts
@@ -74,9 +74,9 @@ export const tabletopLcdButtonsController = defineObject({
 		applyFit();
 
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
-			if (options.customPicture != null && options.customPicture !== '') {
+			if (options.customPicture != null) {
 				screenMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					screenMaterial.emissiveColor = new BABYLON.Color3(1, 1, 1);
 					screenMaterial.emissiveTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/tabletopPictureFrame.ts b/packages/frontend/src/world/room/objects/tabletopPictureFrame.ts
index dd2e2ef669..9664a0b072 100644
--- a/packages/frontend/src/world/room/objects/tabletopPictureFrame.ts
+++ b/packages/frontend/src/world/room/objects/tabletopPictureFrame.ts
@@ -168,7 +168,7 @@ export const tabletopPictureFrame = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				pictureMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					pictureMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					pictureMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/tapestry.ts b/packages/frontend/src/world/room/objects/tapestry.ts
index 1059b907aa..57099b3d96 100644
--- a/packages/frontend/src/world/room/objects/tapestry.ts
+++ b/packages/frontend/src/world/room/objects/tapestry.ts
@@ -99,7 +99,7 @@ export const tapestry = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				pictureMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					pictureMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					pictureMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/wallCanvas.ts b/packages/frontend/src/world/room/objects/wallCanvas.ts
index f6450e6f99..597049ca71 100644
--- a/packages/frontend/src/world/room/objects/wallCanvas.ts
+++ b/packages/frontend/src/world/room/objects/wallCanvas.ts
@@ -85,7 +85,7 @@ export const wallCanvas = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				canvasMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					canvasMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					canvasMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/objects/wallGlassPictureFrame.ts b/packages/frontend/src/world/room/objects/wallGlassPictureFrame.ts
index 0813516f76..49dbf412d9 100644
--- a/packages/frontend/src/world/room/objects/wallGlassPictureFrame.ts
+++ b/packages/frontend/src/world/room/objects/wallGlassPictureFrame.ts
@@ -95,7 +95,7 @@ export const wallGlassPictureFrame = defineObject({
 		const applyCustomPicture = () => new Promise<void>((resolve) => {
 			if (options.customPicture != null) {
 				pictureMaterial.unfreeze();
-				const tex = new BABYLON.Texture(options.customPicture, scene, false, false, undefined, () => {
+				const tex = new BABYLON.Texture(options.customPicture.url, scene, false, false, undefined, () => {
 					pictureMaterial.albedoColor = new BABYLON.Color3(1, 1, 1);
 					pictureMaterial.albedoTexture = tex;
 					applyFit();
diff --git a/packages/frontend/src/world/room/previewEngine.ts b/packages/frontend/src/world/room/previewEngine.ts
index d401c7d6b9..c7e553a307 100644
--- a/packages/frontend/src/world/room/previewEngine.ts
+++ b/packages/frontend/src/world/room/previewEngine.ts
@@ -10,7 +10,9 @@ import EventEmitter from 'eventemitter3';
 import { camelToKebab, WORLD_SCALE, cm, getMeshesBoundingBox, Timer, sleep, ArcRotateCameraManualInput } from '../utility.js';
 import { getObjectDef } from './object-defs.js';
 import { SYSTEM_MESH_NAMES, ModelManager, GRAPHICS_QUALITY } from './utility.js';
-import type { RoomObjectInstance } from './object.js';
+import { convertRawOptions } from './object.js';
+import type { ConvertedOptions, RawOptions, RoomObjectInstance } from './object.js';
+import type { RoomAttachments } from './utility.js';
 import { genId } from '@/utility/id.js';
 import { deepClone } from '@/utility/clone.js';
 
@@ -23,7 +25,8 @@ export class RoomObjectPreviewEngine extends EventEmitter {
 	private camera: BABYLON.ArcRotateCamera;
 	private objectMesh: BABYLON.Mesh | null = null;
 	private objectInstance: RoomObjectInstance | null = null;
-	private objectOptions: any = null;
+	private objectOptions: RawOptions | null = null;
+	private convertedObjectOptions: ConvertedOptions | null = null;
 	private objectType: string | null = null;
 	private envMapIndoor: BABYLON.CubeTexture;
 	private roomLight: BABYLON.SpotLight;
@@ -230,10 +233,10 @@ export class RoomObjectPreviewEngine extends EventEmitter {
 				this.objectOptions[key] = Math.floor(Math.random() * 1000);
 			}
 		}
+		this.convertedObjectOptions = convertRawOptions(def.options.schema, this.objectOptions, { files: [] });
 
 		await this.loadObject_({
 			type,
-			options: this.objectOptions,
 			id,
 		});
 
@@ -290,7 +293,6 @@ export class RoomObjectPreviewEngine extends EventEmitter {
 
 	private async loadObject_(args: {
 		type: string;
-		options: any;
 		id: string;
 	}) {
 		const def = getObjectDef(args.type);
@@ -366,7 +368,7 @@ export class RoomObjectPreviewEngine extends EventEmitter {
 				fixParticleSystem: (ps) => this.sr.fixParticleSystem(ps),
 			},
 			root,
-			options: args.options,
+			options: this.convertedObjectOptions,
 			model,
 			id: args.id,
 			timer: this.timerForEachObject,
@@ -380,10 +382,12 @@ export class RoomObjectPreviewEngine extends EventEmitter {
 		this.objectMesh = root;
 	}
 
-	public updateObjectOption(key: string, value: any) {
+	public updateObjectOption(key: string, value: any, attachments?: RoomAttachments) {
 		this.sr.disableSnapshotRendering();
 		this.objectOptions[key] = value;
-		this.objectInstance?.onOptionsUpdated?.([key, value]);
+		const convertedOptions = convertRawOptions(getObjectDef(this.objectType!).options.schema, this.objectOptions, attachments ?? { files: [] });
+		this.convertedObjectOptions[key] = convertedOptions[key];
+		this.objectInstance?.onOptionsUpdated?.([key, convertedOptions[key]]);
 		this.sr.enableSnapshotRendering();
 		return this.objectOptions;
 	}
@@ -398,6 +402,7 @@ export class RoomObjectPreviewEngine extends EventEmitter {
 			this.objectInstance.dispose?.();
 			this.objectInstance = null;
 			this.objectOptions = null;
+			this.convertedObjectOptions = null;
 			this.objectMesh!.dispose();
 			this.objectMesh = null;
 			this.objectType = null;
diff --git a/packages/frontend/src/world/room/previewEngineController.ts b/packages/frontend/src/world/room/previewEngineController.ts
index ca770c58cb..1eabd642e6 100644
--- a/packages/frontend/src/world/room/previewEngineController.ts
+++ b/packages/frontend/src/world/room/previewEngineController.ts
@@ -4,6 +4,7 @@
  */
 
 import { EngineControllerBase } from '../engineControllerBase.js';
+import type { RoomAttachments } from './utility.js';
 
 export type PreviewEngineControllerOptions = {
 	workerMode?: boolean;
@@ -41,8 +42,8 @@ export class PreviewEngineController extends EngineControllerBase {
 		});
 	}
 
-	public updateObjectOption(key: string, value: any) {
-		this.call('updateObjectOption', [key, value]);
+	public updateObjectOption(key: string, value: any, attachments?: RoomAttachments) {
+		this.call('updateObjectOption', [key, value, attachments]);
 	}
 
 	public loadObject(type: string) {
diff --git a/packages/frontend/src/world/room/utility.ts b/packages/frontend/src/world/room/utility.ts
index 3421035ecd..118acc59e0 100644
--- a/packages/frontend/src/world/room/utility.ts
+++ b/packages/frontend/src/world/room/utility.ts
@@ -4,6 +4,7 @@
  */
 
 import * as BABYLON from '@babylonjs/core';
+import * as Misskey from 'misskey-js';
 import { applyMorphTargetsToMesh, cm, getPlaneUvIndexes, Timer } from '../utility.js';
 
 export const GRAPHICS_QUALITY = {
@@ -22,6 +23,10 @@ export function getLightRangeFactorByGraphicsQuality(quality: number) {
 	}
 }
 
+export type RoomAttachments = {
+	files: Misskey.entities.DriveFile[];
+};
+
 export const SYSTEM_MESH_NAMES = ['__TOP__', '__SIDE__', '__BOTTOM__', '__PICK__', '__COLLISION__'];
 export const SYSTEM_HEYA_MESH_NAMES = ['__ROOM_WALL__', '__ROOM_SIDE__', '__ROOM_FLOOR__', '__ROOM_CEILING__', '__ROOM_TOP__', '__ROOM_BOTTOM__', '__COLLISION__'];
 
diff --git a/packages/frontend/src/world/room/worker.ts b/packages/frontend/src/world/room/worker.ts
index 8a9c8ce8f9..078c647033 100644
--- a/packages/frontend/src/world/room/worker.ts
+++ b/packages/frontend/src/world/room/worker.ts
@@ -6,6 +6,7 @@
 import * as BABYLON from '@babylonjs/core';
 import { RoomEngine } from './engine.js';
 import type { RoomState } from './engine.js';
+import type { RoomAttachments } from './utility.js';
 
 let engine: RoomEngine | null = null;
 let canvas: OffscreenCanvas | null = null;
@@ -17,6 +18,7 @@ onmessage = async (event) => {
 	switch (event.data?.type) {
 		case 'init': {
 			const roomState = event.data.roomState as RoomState;
+			const roomAttachments = event.data.roomAttachments as RoomAttachments;
 			canvas = event.data.canvas as OffscreenCanvas;
 			const babylonEngine = new BABYLON.WebGPUEngine(canvas, { doNotHandleContextLost: true, powerPreference: 'high-performance', antialias: event.data.options.antialias });
 			babylonEngine.compatibilityMode = false;
@@ -25,7 +27,7 @@ onmessage = async (event) => {
 			if (event.data.options.resolution === 2) babylonEngine.setHardwareScalingLevel(0.5);
 			if (event.data.options.resolution === 0.5) babylonEngine.setHardwareScalingLevel(2);
 
-			engine = new RoomEngine(roomState, {
+			engine = new RoomEngine(roomState, roomAttachments, {
 				engine: babylonEngine,
 				...event.data.options,
 			});