diff --git a/docs/project-memory/shared-memory/pitfalls.md b/docs/project-memory/shared-memory/pitfalls.md
index 6550e326b..d05f610c7 100644
--- a/docs/project-memory/shared-memory/pitfalls.md
+++ b/docs/project-memory/shared-memory/pitfalls.md
@@ -151,6 +151,14 @@
 - 验证：Network 中 `/api/editor/projects*`、`PATCH /api/editor/projects/{id}`、素材库接口不应出现 `data:image` / `data:video` / `data:audio`；素材库和图层面板缩略图都能换签显示；`npm run test -- src/components/image-editor/ImageCanvasEditorModel.test.ts src/components/image-editor/useImageCanvasProjectPersistence.test.tsx src/components/image-editor/ImageCanvasAssetRowView.test.tsx src/components/common/PlatformMediaFrame.test.tsx src/services/assetReadUrlService.test.ts src/services/image-editor/editorProjectClient.test.ts`，后端跑 `cargo test -p api-server editor_project --manifest-path server-rs/Cargo.toml`。
 - 关联：`server-rs/crates/api-server/src/editor_project.rs`、`src/components/image-editor/ImageCanvasEditorModel.ts`、`src/components/image-editor/useImageCanvasProjectPersistence.ts`、`src/components/common/PlatformMediaFrame.tsx`、`src/services/assetReadUrlService.ts`。
 
+## 图片画布框选预览要复用源图换签缓存
+
+- 现象：UI 设计素材提取或快速编辑框选时，画布上的红色框选还在，但底部“框选区域预览”卡片变成空白。
+- 原因：预览图从原生 `img` 改成 `ResolvedAssetImage` 后，如果没有传入源图同一套 `objectKey` / `refreshKey`，它会另起一条 `/api/assets/read-url` 缓存维度；画布主图已经显示时，预览仍可能处于空签名或失败缓存状态。
+- 处理：框选预览继续用 `ResolvedAssetImage` 承接私有资源换签，但必须传源图 `objectKey`，并使用 `taskId ?? resourceId` 作为 `refreshKey`，和主画布图片保持同一签名缓存版本。只允许对 `data:`、`blob:` 或已带签名参数的 URL 设置 `fallbackSrc`；不要把裸 `/generated...` 私有路径作为 fallback 写进 `img`。
+- 验证：`npm run test -- src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.test.tsx --reporter=dot` 应断言私有框选预览带 `objectKey`、`refreshKey`，且裸 generated 路径没有 fallback。
+- 关联：`src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.tsx`、`src/components/ResolvedAssetImage.tsx`、`src/hooks/useResolvedAssetReadUrl.ts`、`src/services/assetReadUrlService.ts`。
+
 ## 图片画布发布入口 429 先查自动保存 PATCH 并发
 
 - 现象：发布域名访问画板时出现短时间密集 `429`，Nginx access log 中 `PATCH /api/editor/projects/<projectId>`、生成接口和资料接口混杂，429 行常见 `request_time=0.000`、`upstream_status=-`，error log 写 `limiting connections by zone "genarrative_api_conn"`。
diff --git a/src/components/image-editor/ImageCanvasBasicGenerationComposerView.tsx b/src/components/image-editor/ImageCanvasBasicGenerationComposerView.tsx
index a67db7918..d6b9bf71d 100644
--- a/src/components/image-editor/ImageCanvasBasicGenerationComposerView.tsx
+++ b/src/components/image-editor/ImageCanvasBasicGenerationComposerView.tsx
@@ -65,6 +65,7 @@ function ReferenceChip({
       tone="default"
       icon={<ImageIcon className="h-4 w-4" aria-hidden="true" />}
       imageSrc={reference.src}
+      objectKey={reference.objectKey}
       label={label}
       ariaLabel={label}
       title={reference.label}
diff --git a/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.tsx b/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.tsx
index 0414a17fb..8131d2c16 100644
--- a/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.tsx
+++ b/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.tsx
@@ -1,4 +1,4 @@
-import { ChevronDown, X } from 'lucide-react';
+import { ChevronDown, ImageIcon, X } from 'lucide-react';
 import {
   type CSSProperties,
   type Dispatch,
@@ -29,6 +29,7 @@ import {
   CHARACTER_ANIMATION_DURATION_OPTIONS,
   CHARACTER_ANIMATION_RATIO_OPTIONS,
 } from './ImageCanvasGenerationModel';
+import { ImageCanvasReferenceSlot } from './ImageCanvasReferenceSlot';
 import { useImageCanvasFloatingOptionDismiss } from './useImageCanvasFloatingOptionDismiss';
 
 type ImageCanvasCharacterAnimationPanelViewProps = {
@@ -177,17 +178,15 @@ export function ImageCanvasCharacterAnimationPanelView({
         }}
       >
         <div className="image-canvas-editor__reference-strip">
-          <span
-            className="image-canvas-editor__reference-chip image-canvas-editor__reference-chip--character"
+          <ImageCanvasReferenceSlot
+            tone="character"
+            icon={<ImageIcon className="h-4 w-4" aria-hidden="true" />}
+            imageSrc={sourceLayer.src}
+            objectKey={sourceLayer.objectKey}
+            label={sourceLayer.title}
+            ariaLabel={sourceLayer.title}
             title={sourceLayer.title}
-          >
-            <span className="image-canvas-editor__reference-chip-icon">
-              <img src={sourceLayer.src} alt="" aria-hidden="true" />
-            </span>
-            <span className="image-canvas-editor__reference-chip-label">
-              {sourceLayer.title}
-            </span>
-          </span>
+          />
         </div>
         <EditorIconButton
           className="image-canvas-editor__generation-close"
diff --git a/src/components/image-editor/ImageCanvasCharacterGenerationComposerView.tsx b/src/components/image-editor/ImageCanvasCharacterGenerationComposerView.tsx
index c77680031..350a40773 100644
--- a/src/components/image-editor/ImageCanvasCharacterGenerationComposerView.tsx
+++ b/src/components/image-editor/ImageCanvasCharacterGenerationComposerView.tsx
@@ -70,6 +70,7 @@ function ReferenceChip({
       tone="character"
       icon={<ImagePlus className="h-4 w-4" aria-hidden="true" />}
       imageSrc={reference.src}
+      objectKey={reference.objectKey}
       label={label}
       ariaLabel={label}
       title={reference.label}
@@ -127,6 +128,7 @@ export function ImageCanvasCharacterGenerationComposerView({
           tone="spec"
           icon={<ClipboardList className="h-4 w-4" aria-hidden="true" />}
           imageSrc={dialog.characterSpecReference?.src}
+          objectKey={dialog.characterSpecReference?.objectKey}
           label="角色规范"
           ariaLabel={dialog.characterSpecReference?.label ?? '角色规范'}
           title={dialog.characterSpecReference?.label ?? '角色规范'}
diff --git a/src/components/image-editor/ImageCanvasGenerationComposerView.tsx b/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
index f03ef5f02..d7573c6ed 100644
--- a/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
+++ b/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
@@ -186,7 +186,13 @@ function VideoReferenceChip({
   index,
   onRemove,
 }: {
-  reference: { id: string; label: string; src: string; mediaType?: string };
+  reference: {
+    id: string;
+    label: string;
+    src: string;
+    mediaType?: string;
+    objectKey?: string | null;
+  };
   index: number;
   onRemove: () => void;
 }) {
@@ -211,6 +217,7 @@ function VideoReferenceChip({
       tone={mediaType === 'audio' ? 'audio' : 'video'}
       icon={icon}
       imageSrc={mediaType === 'image' ? reference.src : undefined}
+      objectKey={mediaType === 'image' ? reference.objectKey : undefined}
       label={label}
       ariaLabel={label}
       title={reference.label}
diff --git a/src/components/image-editor/ImageCanvasIconSpritesheetComposerView.tsx b/src/components/image-editor/ImageCanvasIconSpritesheetComposerView.tsx
index c1b925994..2f984da58 100644
--- a/src/components/image-editor/ImageCanvasIconSpritesheetComposerView.tsx
+++ b/src/components/image-editor/ImageCanvasIconSpritesheetComposerView.tsx
@@ -107,6 +107,7 @@ export function ImageCanvasIconSpritesheetComposerView({
           className="image-canvas-editor__icon-spec-card"
           icon={<ImageIcon className="h-4 w-4" aria-hidden="true" />}
           imageSrc={dialog.iconSpecReference?.src}
+          objectKey={dialog.iconSpecReference?.objectKey}
           label="图标规范"
           ariaLabel={dialog.iconSpecReference?.label ?? '图标规范'}
           title={dialog.iconSpecReference?.label ?? '图标规范'}
diff --git a/src/components/image-editor/ImageCanvasPublicationMaterialsDemoPanelView.tsx b/src/components/image-editor/ImageCanvasPublicationMaterialsDemoPanelView.tsx
index 35777e936..8d96176ad 100644
--- a/src/components/image-editor/ImageCanvasPublicationMaterialsDemoPanelView.tsx
+++ b/src/components/image-editor/ImageCanvasPublicationMaterialsDemoPanelView.tsx
@@ -92,6 +92,7 @@ function ReferenceThumb({
       tone="default"
       icon={<ImagePlus className="h-4 w-4" aria-hidden="true" />}
       imageSrc={reference.src}
+      objectKey={reference.objectKey}
       label={label}
       ariaLabel={label}
       title={reference.label}
diff --git a/src/components/image-editor/ImageCanvasQuickEditPanelView.tsx b/src/components/image-editor/ImageCanvasQuickEditPanelView.tsx
index af95d6bef..b21e18524 100644
--- a/src/components/image-editor/ImageCanvasQuickEditPanelView.tsx
+++ b/src/components/image-editor/ImageCanvasQuickEditPanelView.tsx
@@ -82,6 +82,7 @@ function QuickEditReferenceChip({
       tone="quick-edit"
       icon={<ImageIcon className="h-4 w-4" aria-hidden="true" />}
       imageSrc={reference.src}
+      objectKey={reference.objectKey}
       label={label}
       ariaLabel={label}
       title={reference.label}
diff --git a/src/components/image-editor/ImageCanvasReferenceSlot.test.tsx b/src/components/image-editor/ImageCanvasReferenceSlot.test.tsx
new file mode 100644
index 000000000..b4c730ac9
--- /dev/null
+++ b/src/components/image-editor/ImageCanvasReferenceSlot.test.tsx
@@ -0,0 +1,52 @@
+/* @vitest-environment jsdom */
+
+import { render } from '@testing-library/react';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { ImageCanvasReferenceSlot } from './ImageCanvasReferenceSlot';
+
+const useResolvedAssetReadUrlMock = vi.hoisted(() => vi.fn());
+
+vi.mock('../../hooks/useResolvedAssetReadUrl', () => ({
+  useResolvedAssetReadUrl: useResolvedAssetReadUrlMock,
+}));
+
+describe('ImageCanvasReferenceSlot', () => {
+  beforeEach(() => {
+    useResolvedAssetReadUrlMock.mockImplementation(
+      (source: string | null | undefined, options?: { objectKey?: string | null }) => ({
+        resolvedUrl: options?.objectKey
+          ? `https://oss.example.com/${options.objectKey}?signature=1`
+          : (source ?? ''),
+        isResolving: false,
+        shouldResolve: Boolean(options?.objectKey),
+      }),
+    );
+  });
+
+  it('resolves private generated reference thumbnails through objectKey', () => {
+    const { container } = render(
+      <ImageCanvasReferenceSlot
+        tone="character"
+        icon={<span data-testid="fallback-icon" />}
+        imageSrc="/generated-character-drafts/editor/legacy-resources/stale.png"
+        objectKey="generated-character-drafts/editor/legacy-resources/editor-resource-1.png"
+        label="角色参考"
+        ariaLabel="角色参考"
+      />,
+    );
+
+    const image = container.querySelector('img');
+
+    expect(useResolvedAssetReadUrlMock).toHaveBeenCalledWith(
+      '/generated-character-drafts/editor/legacy-resources/stale.png',
+      expect.objectContaining({
+        objectKey:
+          'generated-character-drafts/editor/legacy-resources/editor-resource-1.png',
+      }),
+    );
+    expect(image?.getAttribute('src')).toBe(
+      'https://oss.example.com/generated-character-drafts/editor/legacy-resources/editor-resource-1.png?signature=1',
+    );
+  });
+});
diff --git a/src/components/image-editor/ImageCanvasReferenceSlot.tsx b/src/components/image-editor/ImageCanvasReferenceSlot.tsx
index 79e41ff8f..f35b1e200 100644
--- a/src/components/image-editor/ImageCanvasReferenceSlot.tsx
+++ b/src/components/image-editor/ImageCanvasReferenceSlot.tsx
@@ -1,6 +1,8 @@
 import { type ReactNode, type RefObject } from 'react';
 import { X } from 'lucide-react';
 
+import { ResolvedAssetImage } from '../ResolvedAssetImage';
+
 type ImageCanvasReferenceSlotTone =
   | 'default'
   | 'spec'
@@ -20,6 +22,7 @@ type ImageCanvasReferenceSlotProps = {
   ariaLabel: string;
   title?: string;
   imageSrc?: string | null;
+  objectKey?: string | null;
   disabled?: boolean;
   isAdd?: boolean;
   onClick?: () => void;
@@ -36,13 +39,14 @@ export function ImageCanvasReferenceSlot({
   ariaLabel,
   title,
   imageSrc,
+  objectKey,
   disabled = false,
   isAdd = false,
   onClick,
   onRemove,
   removeLabel,
 }: ImageCanvasReferenceSlotProps) {
-  const hasPreviewImage = Boolean(imageSrc);
+  const hasPreviewImage = Boolean(imageSrc?.trim() || objectKey?.trim());
   const slotClassName = [
     'image-canvas-editor__reference-chip',
     `image-canvas-editor__reference-chip--${tone}`,
@@ -58,7 +62,12 @@ export function ImageCanvasReferenceSlot({
     <>
       <span className="image-canvas-editor__reference-chip-icon">
         {hasPreviewImage ? (
-          <img src={imageSrc ?? undefined} alt="" aria-hidden="true" />
+          <ResolvedAssetImage
+            src={imageSrc}
+            objectKey={objectKey}
+            alt=""
+            aria-hidden="true"
+          />
         ) : (
           icon
         )}
diff --git a/src/components/image-editor/ImageCanvasSpecGenerationPanelView.tsx b/src/components/image-editor/ImageCanvasSpecGenerationPanelView.tsx
index c7ec9bc99..79158b7b2 100644
--- a/src/components/image-editor/ImageCanvasSpecGenerationPanelView.tsx
+++ b/src/components/image-editor/ImageCanvasSpecGenerationPanelView.tsx
@@ -140,6 +140,7 @@ export function ImageCanvasSpecGenerationPanelView({
                 )
               }
               imageSrc={reference?.src}
+              objectKey={reference?.objectKey}
               label={referenceSlotLabel}
               ariaLabel={referenceLabel}
               title={reference?.label ?? referenceLabel}
diff --git a/src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.test.tsx b/src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.test.tsx
index 8fdf99399..a1629d9fb 100644
--- a/src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.test.tsx
+++ b/src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.test.tsx
@@ -1,12 +1,41 @@
 /* @vitest-environment jsdom */
 
 import { fireEvent, render, screen, within } from '@testing-library/react';
+import type { ImgHTMLAttributes } from 'react';
 import { describe, expect, it, vi } from 'vitest';
 
 import type { CanvasLayer } from './ImageCanvasEditorTypes';
 import type { UiAssetExtractionState } from './ImageCanvasUiAssetExtractionModel';
 import { ImageCanvasUiAssetExtractionOverlayView } from './ImageCanvasUiAssetExtractionOverlayView';
 
+type ResolvedAssetImageMockProps = Omit<
+  ImgHTMLAttributes<HTMLImageElement>,
+  'src'
+> & {
+  src?: string | null;
+  objectKey?: string | null;
+  fallbackSrc?: string | null;
+  refreshKey?: string | number | null;
+};
+
+vi.mock('../ResolvedAssetImage', () => ({
+  ResolvedAssetImage: ({
+    src,
+    objectKey,
+    fallbackSrc,
+    refreshKey,
+    ...props
+  }: ResolvedAssetImageMockProps) => (
+    <img
+      {...props}
+      src={src ?? fallbackSrc ?? ''}
+      data-object-key={objectKey ?? ''}
+      data-fallback-src={fallbackSrc ?? ''}
+      data-refresh-key={refreshKey == null ? '' : String(refreshKey)}
+    />
+  ),
+}));
+
 function createLayer(overrides: Partial<CanvasLayer> = {}): CanvasLayer {
   return {
     id: 'layer-source',
@@ -168,6 +197,50 @@ describe('ImageCanvasUiAssetExtractionOverlayView', () => {
     expect(previewImage.style.top).toBe('-200%');
   });
 
+  it('reuses the source layer signed read-url cache for private crop previews', () => {
+    render(
+      <ImageCanvasUiAssetExtractionOverlayView
+        sourceLayer={createLayer({
+          src: '/generated-editor-assets/project-1/source.png',
+          objectKey: 'generated-editor-assets/project-1/source.png',
+          resourceId: 'resource-private',
+          taskId: 'task-private',
+        })}
+        viewport={{ x: 10, y: 20, scale: 1 }}
+        state={createState({
+          marks: [
+            {
+              id: 'mark-1',
+              tool: 'rect',
+              x: 160,
+              y: 120,
+              width: 80,
+              height: 60,
+            },
+          ],
+        })}
+        onToolChange={vi.fn()}
+        onPointerStart={vi.fn()}
+        onPointerMove={vi.fn()}
+        onPointerEnd={vi.fn()}
+        onSubmit={vi.fn()}
+      />,
+    );
+
+    const preview = screen.getByLabelText('框选区域预览 1');
+    const previewImage = within(preview).getByRole('img', {
+      name: '源图框选预览 1',
+    });
+
+    expect(previewImage.getAttribute('data-object-key')).toBe(
+      'generated-editor-assets/project-1/source.png',
+    );
+    expect(previewImage.getAttribute('data-refresh-key')).toBe(
+      'task-private',
+    );
+    expect(previewImage.getAttribute('data-fallback-src')).toBe('');
+  });
+
   it('shows numbered labels for quick edit red selections', () => {
     const { container } = render(
       <ImageCanvasUiAssetExtractionOverlayView
diff --git a/src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.tsx b/src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.tsx
index 91694c6e3..59e02ca15 100644
--- a/src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.tsx
+++ b/src/components/image-editor/ImageCanvasUiAssetExtractionOverlayView.tsx
@@ -4,6 +4,7 @@ import type { PointerEvent as ReactPointerEvent } from 'react';
 
 import { PlatformActionButton } from '../common/PlatformActionButton';
 import { PlatformIconButton } from '../common/PlatformIconButton';
+import { ResolvedAssetImage } from '../ResolvedAssetImage';
 import type { CanvasLayer, CanvasViewport } from './ImageCanvasEditorTypes';
 import {
   calculateEditorIconSpritesheetPrice,
@@ -127,23 +128,48 @@ function resolveMarkPreviewBounds(
   });
 }
 
-function renderMarkPreview(
-  mark: UiAssetExtractionMark,
-  index: number,
-  sourceLayer: CanvasLayer,
-) {
+function resolveMarkPreviewFallbackSrc(sourceSrc: string) {
+  const normalizedSrc = sourceSrc.trim();
+  if (!normalizedSrc) {
+    return undefined;
+  }
+  if (/^(?:data|blob):/iu.test(normalizedSrc)) {
+    return normalizedSrc;
+  }
+  if (
+    /^https?:\/\//iu.test(normalizedSrc) &&
+    /[?&](?:x-oss-signature|OSSAccessKeyId|Signature)=/iu.test(normalizedSrc)
+  ) {
+    return normalizedSrc;
+  }
+  return undefined;
+}
+
+function UiAssetExtractionMarkPreview({
+  mark,
+  index,
+  sourceLayer,
+}: {
+  mark: UiAssetExtractionMark;
+  index: number;
+  sourceLayer: CanvasLayer;
+}) {
   const bounds = resolveMarkPreviewBounds(mark, sourceLayer);
   const originalWidth = Math.max(1, sourceLayer.originalWidth);
   const originalHeight = Math.max(1, sourceLayer.originalHeight);
+  const previewRefreshKey = sourceLayer.taskId ?? sourceLayer.resourceId;
   return (
     <div
       key={mark.id}
       aria-label={`框选区域预览 ${index + 1}`}
       className="image-canvas-editor__ui-extraction-preview"
     >
-      <img
+      <ResolvedAssetImage
         alt={`${sourceLayer.title}框选预览 ${index + 1}`}
         src={sourceLayer.src}
+        objectKey={sourceLayer.objectKey}
+        fallbackSrc={resolveMarkPreviewFallbackSrc(sourceLayer.src)}
+        refreshKey={previewRefreshKey}
         style={{
           width: `${(originalWidth / bounds.width) * 100}%`,
           height: `${(originalHeight / bounds.height) * 100}%`,
@@ -156,6 +182,21 @@ function renderMarkPreview(
   );
 }
 
+function renderMarkPreview(
+  mark: UiAssetExtractionMark,
+  index: number,
+  sourceLayer: CanvasLayer,
+) {
+  return (
+    <UiAssetExtractionMarkPreview
+      key={mark.id}
+      mark={mark}
+      index={index}
+      sourceLayer={sourceLayer}
+    />
+  );
+}
+
 function renderMark(
   mark: UiAssetExtractionMark,
   index: number,
diff --git a/src/components/image-editor/ImageCanvasWorldView.test.tsx b/src/components/image-editor/ImageCanvasWorldView.test.tsx
index 7c8301309..1f08c69cf 100644
--- a/src/components/image-editor/ImageCanvasWorldView.test.tsx
+++ b/src/components/image-editor/ImageCanvasWorldView.test.tsx
@@ -962,6 +962,8 @@ describe('ImageCanvasWorldView', () => {
       resolvedUrl:
         source === '/generated-character-drafts/editor-videos/video-7.mp4'
           ? 'https://oss.example.com/video-7.mp4?signature=1'
+          : source === '/generated-character-drafts/editor/video-7-poster.png'
+            ? 'https://oss.example.com/video-7-poster.png?signature=1'
           : source,
       isResolving: false,
       shouldResolve: true,
@@ -971,6 +973,7 @@ describe('ImageCanvasWorldView', () => {
       src: '/generated-character-drafts/editor-videos/video-7.mp4',
       mediaType: 'video',
       assetKind: 'video',
+      thumbnailSrc: '/generated-character-drafts/editor/video-7-poster.png',
       width: 854,
       height: 480,
       originalWidth: 854,
@@ -988,6 +991,9 @@ describe('ImageCanvasWorldView', () => {
     expect(video.getAttribute('src')).toBe(
       'https://oss.example.com/video-7.mp4?signature=1',
     );
+    expect(video.getAttribute('poster')).toBe(
+      'https://oss.example.com/video-7-poster.png?signature=1',
+    );
     expect(video.hasAttribute('controls')).toBe(true);
     expect(video.hasAttribute('playsinline')).toBe(true);
     expect(video.getAttribute('preload')).toBe('metadata');
diff --git a/src/components/image-editor/ImageCanvasWorldView.tsx b/src/components/image-editor/ImageCanvasWorldView.tsx
index 0226bccda..a58457986 100644
--- a/src/components/image-editor/ImageCanvasWorldView.tsx
+++ b/src/components/image-editor/ImageCanvasWorldView.tsx
@@ -583,6 +583,9 @@ function ImageCanvasVideoLayer({
     objectKey: layer.objectKey,
     refreshKey: layer.taskId ?? layer.resourceId,
   });
+  const { resolvedUrl: posterUrl } = useResolvedAssetReadUrl(layer.thumbnailSrc, {
+    refreshKey: `${layer.taskId ?? layer.resourceId}:poster`,
+  });
   const [showGeneratedPreview, setShowGeneratedPreview] = useState(
     !layer.thumbnailSrc,
   );
@@ -599,7 +602,7 @@ function ImageCanvasVideoLayer({
       <video
         className="image-canvas-editor__layer-video"
         src={resolvedUrl || undefined}
-        poster={layer.thumbnailSrc ?? undefined}
+        poster={posterUrl || undefined}
         controls
         playsInline
         preload="metadata"