diff --git a/docs/【编辑器】画布Agent对话面板-2026-07-03.md b/docs/【编辑器】画布Agent对话面板-2026-07-03.md
index 51eb670df..34779120b 100644
--- a/docs/【编辑器】画布Agent对话面板-2026-07-03.md
+++ b/docs/【编辑器】画布Agent对话面板-2026-07-03.md
@@ -117,7 +117,7 @@
 5. 生成中的进行中动画；
 6. 错误气泡（失败/余额不足，带原因）；
 7. 普通消息请求等待期间禁用发送按钮，不提供客户端停止操作；前端持续等待后端响应，避免后端已持久化消息但前端中断请求后产生会话状态错位。
-8. 桌面端右键消息正文可复制该条可见文本；右键消息附件或生成结果可下载素材，图片额外支持复制图片本体和“引用”到当前输入区。引用复用附件去重、9 张上限和发送链路；右键菜单只保留已有的 `objectKey` 与素材 `source`，引用时由输入区优先按 `objectKey`、缺失时按 `source` 从当前画布和素材库选项重新查询并构造 `EditorAgentAttachmentRef`，同时命中时画布优先。
+8. 桌面端右键消息正文可复制该条可见文本；右键消息附件或生成结果可下载素材，图片额外支持复制图片本体和“引用”到当前输入区。引用复用附件去重、9 张上限和发送链路；
 9. 消息右键菜单遵循 Canva 式单实例交互：任一菜单已打开时，下一次右键必须先关闭旧菜单；新落点是消息正文或素材时再在新位置打开对应菜单，新落点没有右键动作时仅收起旧菜单，不允许多个消息菜单并存。复制、引用或下载成功后自动关闭菜单；失败时保留菜单和失败状态，避免错误无提示消失。
 
 不做（明确排除，防止后人补齐）：
diff --git a/src/components/image-editor/EditorAgentConversation/AttachmentChip.tsx b/src/components/image-editor/EditorAgentConversation/AttachmentChip.tsx
index b5596b7a5..b4e9cfaeb 100644
--- a/src/components/image-editor/EditorAgentConversation/AttachmentChip.tsx
+++ b/src/components/image-editor/EditorAgentConversation/AttachmentChip.tsx
@@ -22,9 +22,9 @@ function AttachmentChip({
         onRightClickMenu
           ? (event) =>
               onRightClickMenu(event, {
+                ...attachment,
+                kind: 'attachment',
                 mediaType: 'image',
-                source: attachment.imageSrc,
-                objectKey: attachment.objectKey,
                 suggestedFileName: label,
               })
           : undefined
diff --git a/src/components/image-editor/EditorAgentConversation/EditorAgentConversationPanelView.test.tsx b/src/components/image-editor/EditorAgentConversation/EditorAgentConversationPanelView.test.tsx
index 26e249099..ef29dcfb7 100644
--- a/src/components/image-editor/EditorAgentConversation/EditorAgentConversationPanelView.test.tsx
+++ b/src/components/image-editor/EditorAgentConversation/EditorAgentConversationPanelView.test.tsx
@@ -531,6 +531,154 @@ describe('EditorAgentConversationPanelView', () => {
     expect(screen.queryByRole('option', { name: 'conversation-1' })).toBeNull();
   });
 
+  it('references a historical pasted attachment outside the current canvas', async () => {
+    const client = createClient();
+    vi.mocked(client.getConversation).mockResolvedValue({
+      conversationId: 'conversation-1',
+      projectId: 'project-1',
+      title: '历史附件',
+      messages: [
+        {
+          id: 8,
+          role: 'user',
+          text: '参考这张粘贴图',
+          attachments: [
+            {
+              source: 'canvas_resource',
+              referenceId: 'resource-historical-paste',
+              objectKey: 'editor/agent-paste/historical.png',
+              imageSrc: '/generated/historical-paste.png',
+              thumbnailSrc: null,
+              label: '历史粘贴图',
+              width: 320,
+              height: 240,
+            },
+          ],
+          toolCall: null,
+          createdAt: '2026-07-20T00:00:00.000Z',
+        },
+      ],
+      createdAt: '2026-07-20T00:00:00.000Z',
+      updatedAt: '2026-07-20T00:00:10.000Z',
+    });
+
+    render(
+      <EditorAgentConversationPanelView
+        open
+        onToggleOpen={vi.fn()}
+        client={client}
+        layers={[]}
+        assets={[]}
+      />,
+    );
+
+    const historicalAttachment = await screen.findByText('历史粘贴图');
+    fireEvent.contextMenu(historicalAttachment.closest('.group')!);
+    fireEvent.click(screen.getByRole('menuitem', { name: '引用' }));
+    await waitFor(() => {
+      expect(screen.getAllByText('历史粘贴图')).toHaveLength(2);
+    });
+
+    fireEvent.click(screen.getByRole('button', { name: '发送' }));
+    await waitFor(() => {
+      expect(client.sendMessage).toHaveBeenCalledWith(
+        'conversation-1',
+        expect.objectContaining({
+          attachments: [
+            {
+              source: 'canvas_resource',
+              referenceId: 'resource-historical-paste',
+              objectKey: 'editor/agent-paste/historical.png',
+              imageSrc: '/generated/historical-paste.png',
+              thumbnailSrc: null,
+              label: '历史粘贴图',
+              width: 320,
+              height: 240,
+            },
+          ],
+        }),
+        expect.any(Object),
+      );
+    });
+  });
+
+  it('prefers the current attachment matched by source and reference id', async () => {
+    const client = createClient();
+    vi.mocked(client.getConversation).mockResolvedValue({
+      conversationId: 'conversation-1',
+      projectId: 'project-1',
+      title: '附件更新',
+      messages: [
+        {
+          id: 8,
+          role: 'user',
+          text: '参考旧版图片',
+          attachments: [
+            {
+              source: 'canvas_resource',
+              referenceId: 'resource-updated',
+              objectKey: 'editor/old.png',
+              imageSrc: '/generated/old.png',
+              label: '旧版附件',
+            },
+          ],
+          toolCall: null,
+          createdAt: '2026-07-20T00:00:00.000Z',
+        },
+      ],
+      createdAt: '2026-07-20T00:00:00.000Z',
+      updatedAt: '2026-07-20T00:00:10.000Z',
+    });
+
+    render(
+      <EditorAgentConversationPanelView
+        open
+        onToggleOpen={vi.fn()}
+        client={client}
+        layers={[
+          {
+            id: 'layer-updated',
+            resourceId: 'resource-updated',
+            title: '最新附件',
+            src: '/generated/current.png',
+            objectKey: 'editor/current.png',
+            x: 0,
+            y: 0,
+            width: 512,
+            height: 512,
+            originalWidth: 512,
+            originalHeight: 512,
+            zIndex: 1,
+            sourceType: 'generated',
+          },
+        ]}
+      />,
+    );
+
+    const historicalAttachment = await screen.findByText('旧版附件');
+    fireEvent.contextMenu(historicalAttachment.closest('.group')!);
+    fireEvent.click(screen.getByRole('menuitem', { name: '引用' }));
+    expect(await screen.findByText('最新附件')).toBeTruthy();
+
+    fireEvent.click(screen.getByRole('button', { name: '发送' }));
+    await waitFor(() => {
+      expect(client.sendMessage).toHaveBeenCalledWith(
+        'conversation-1',
+        expect.objectContaining({
+          attachments: [
+            expect.objectContaining({
+              source: 'canvas_resource',
+              referenceId: 'resource-updated',
+              objectKey: 'editor/current.png',
+              imageSrc: '/generated/current.png',
+            }),
+          ],
+        }),
+        expect.any(Object),
+      );
+    });
+  });
+
   it('keeps a referenced image when a pending paste upload finishes', async () => {
     const client = createClient();
     vi.mocked(client.getConversation).mockResolvedValue({
diff --git a/src/components/image-editor/EditorAgentConversation/MessageBubble.test.tsx b/src/components/image-editor/EditorAgentConversation/MessageBubble.test.tsx
index 6aec36f33..2d9866437 100644
--- a/src/components/image-editor/EditorAgentConversation/MessageBubble.test.tsx
+++ b/src/components/image-editor/EditorAgentConversation/MessageBubble.test.tsx
@@ -284,7 +284,10 @@ describe('MessageBubble', () => {
 
     expect(onReferenceImage).toHaveBeenCalledWith(
       expect.objectContaining({
-        source: '/generated-editor-images/reference.png',
+        kind: 'attachment',
+        source: 'canvas_resource',
+        referenceId: 'resource-reference-1',
+        imageSrc: '/generated-editor-images/reference.png',
         objectKey: 'editor/reference.png',
       }),
     );
@@ -339,7 +342,8 @@ describe('MessageBubble', () => {
     fireEvent.click(screen.getByRole('menuitem', { name: '引用' }));
     expect(onReferenceImage).toHaveBeenCalledWith(
       expect.objectContaining({
-        source: '/generated-editor-images/generated.png',
+        kind: 'generated_media',
+        mediaSrc: '/generated-editor-images/generated.png',
         objectKey: 'editor/generated.png',
       }),
     );
diff --git a/src/components/image-editor/EditorAgentConversation/MessageBubbleRightClickMenu.tsx b/src/components/image-editor/EditorAgentConversation/MessageBubbleRightClickMenu.tsx
index 0bbb3c367..743813b4f 100644
--- a/src/components/image-editor/EditorAgentConversation/MessageBubbleRightClickMenu.tsx
+++ b/src/components/image-editor/EditorAgentConversation/MessageBubbleRightClickMenu.tsx
@@ -2,6 +2,7 @@ import { useEffect, useLayoutEffect, useRef, useState } from 'react';
 import { createPortal } from 'react-dom';
 
 import {
+  contextAssetMediaSrc,
   type EditorAgentContextAsset,
   EditorAgentRightClickAction,
   type RightClickMenuTarget,
@@ -176,7 +177,7 @@ export function MessageBubbleRightClickMenu({
         <>
           {target.asset.mediaType === 'image' ? (
             <>
-              {target.asset.source.trim() ? (
+              {contextAssetMediaSrc(target.asset).trim() ? (
                 <button
                   type="button"
                   role="menuitem"
diff --git a/src/components/image-editor/EditorAgentConversation/ToolCallView.tsx b/src/components/image-editor/EditorAgentConversation/ToolCallView.tsx
index 74ba190cc..65279fd36 100644
--- a/src/components/image-editor/EditorAgentConversation/ToolCallView.tsx
+++ b/src/components/image-editor/EditorAgentConversation/ToolCallView.tsx
@@ -117,8 +117,9 @@ function ToolCallView({
                 onRightClickMenu
                   ? (event) =>
                       onRightClickMenu(event, {
+                        kind: 'generated_media',
                         mediaType: 'image',
-                        source: image.imageSrc,
+                        mediaSrc: image.imageSrc,
                         objectKey: image.objectKey,
                         suggestedFileName: `Agent生成图片-${index + 1}`,
                       })
@@ -146,8 +147,9 @@ function ToolCallView({
                 onRightClickMenu
                   ? (event) =>
                       onRightClickMenu(event, {
+                        kind: 'generated_media',
                         mediaType: 'video',
-                        source: video.videoSrc,
+                        mediaSrc: video.videoSrc,
                         objectKey: video.objectKey,
                         suggestedFileName: `Agent生成视频-${index + 1}`,
                       })
@@ -180,8 +182,9 @@ function ToolCallView({
                 onRightClickMenu
                   ? (event) =>
                       onRightClickMenu(event, {
+                        kind: 'generated_media',
                         mediaType: 'audio',
-                        source: audio.audioSrc,
+                        mediaSrc: audio.audioSrc,
                         objectKey: audio.objectKey,
                         suggestedFileName: `Agent生成音频-${index + 1}`,
                       })
diff --git a/src/components/image-editor/EditorAgentConversation/common.ts b/src/components/image-editor/EditorAgentConversation/common.ts
index c6390426b..fbcf716ce 100644
--- a/src/components/image-editor/EditorAgentConversation/common.ts
+++ b/src/components/image-editor/EditorAgentConversation/common.ts
@@ -9,12 +9,19 @@ export enum EditorAgentRightClickAction {
   DownloadAsset = 'download_asset',
 }
 
-export type EditorAgentContextAsset = {
-  mediaType: 'image' | 'video' | 'audio';
-  source: string;
-  objectKey?: string | null;
-  suggestedFileName: string;
-};
+export type EditorAgentContextAsset =
+  | (EditorAgentAttachmentRef & {
+      kind: 'attachment';
+      mediaType: 'image';
+      suggestedFileName: string;
+    })
+  | {
+      kind: 'generated_media';
+      mediaType: 'image' | 'video' | 'audio';
+      mediaSrc: string;
+      objectKey?: string | null;
+      suggestedFileName: string;
+    };
 
 export type RightClickMenuTarget =
   | { kind: 'text'; text: string }
@@ -28,3 +35,7 @@ export type RightClickMenuHandler = (
 export function attachmentKey(attachment: EditorAgentAttachmentRef) {
   return `${attachment.source}:${attachment.referenceId}`;
 }
+
+export function contextAssetMediaSrc(asset: EditorAgentContextAsset) {
+  return asset.kind === 'attachment' ? asset.imageSrc : asset.mediaSrc;
+}
diff --git a/src/components/image-editor/EditorAgentConversation/useConversationAttachments.ts b/src/components/image-editor/EditorAgentConversation/useConversationAttachments.ts
index ca5205276..626d56df5 100644
--- a/src/components/image-editor/EditorAgentConversation/useConversationAttachments.ts
+++ b/src/components/image-editor/EditorAgentConversation/useConversationAttachments.ts
@@ -18,7 +18,11 @@ import { probeImageFileDimensions } from '@/src/components/image-editor/ImageCan
 import { uploadEditorMediaAssetFile } from '@/src/services/image-editor/editorMediaAssetUploadClient.ts';
 import { createEditorProjectResource } from '@/src/services/image-editor/editorProjectClient.ts';
 
-import { attachmentKey, type EditorAgentContextAsset } from './common.ts';
+import {
+  attachmentKey,
+  contextAssetMediaSrc,
+  type EditorAgentContextAsset,
+} from './common.ts';
 
 export type AttachmentPickerTab = 'canvas' | 'library';
 
@@ -255,11 +259,24 @@ export function useConversationAttachments({
 
   const referenceContextAsset = useCallback(
     (asset: EditorAgentContextAsset) => {
+      const directAttachment: EditorAgentAttachmentRef | undefined =
+        asset.kind === 'attachment'
+          ? {
+              source: asset.source,
+              referenceId: asset.referenceId,
+              objectKey: asset.objectKey,
+              imageSrc: asset.imageSrc,
+              thumbnailSrc: asset.thumbnailSrc,
+              label: asset.label,
+              width: asset.width,
+              height: asset.height,
+            }
+          : undefined;
+      const referenceOption = directAttachment
+        ? attachmentOptionsByKey.get(attachmentKey(directAttachment))
+        : undefined;
       const objectKey = asset.objectKey?.trim();
-      const source = asset.source.trim();
-      if (!objectKey && !source) {
-        return false;
-      }
+      const mediaSrc = contextAssetMediaSrc(asset).trim();
       const objectKeyOption = objectKey
         ? attachmentOptions.find(
             ({ attachment }) => attachment.objectKey?.trim() === objectKey,
@@ -269,13 +286,18 @@ export function useConversationAttachments({
         objectKeyOption ||
         attachmentOptions.find(({ attachment }) => {
           return (
-            attachment.imageSrc.trim() === source ||
-            attachment.thumbnailSrc?.trim() === source
+            attachment.imageSrc.trim() === mediaSrc ||
+            attachment.thumbnailSrc?.trim() === mediaSrc
           );
         });
-      return option ? appendAttachments([option.attachment]) : false;
+      const matchedAttachment =
+        referenceOption?.attachment || option?.attachment || directAttachment;
+      return matchedAttachment?.referenceId.trim() &&
+        matchedAttachment.imageSrc.trim()
+        ? appendAttachments([matchedAttachment])
+        : false;
     },
-    [appendAttachments, attachmentOptions],
+    [appendAttachments, attachmentOptions, attachmentOptionsByKey],
   );
 
   const handleInputPaste = useCallback(
diff --git a/src/components/image-editor/EditorAgentConversation/useRightClickMenu.ts b/src/components/image-editor/EditorAgentConversation/useRightClickMenu.ts
index b69dd09de..5d29b1230 100644
--- a/src/components/image-editor/EditorAgentConversation/useRightClickMenu.ts
+++ b/src/components/image-editor/EditorAgentConversation/useRightClickMenu.ts
@@ -8,6 +8,7 @@ import { readAssetBytes } from '@/src/services/assetReadUrlService.ts';
 import { copyTextToClipboard } from '@/src/services/clipboard.ts';
 
 import {
+  contextAssetMediaSrc,
   type EditorAgentContextAsset,
   EditorAgentRightClickAction,
   type RightClickMenuTarget,
@@ -93,7 +94,7 @@ async function copyAssetImage(asset: EditorAgentContextAsset) {
     return false;
   }
   try {
-    const pngBlob = readAssetBytes(asset.source, {
+    const pngBlob = readAssetBytes(contextAssetMediaSrc(asset), {
       objectKey: asset.objectKey,
     }).then(async (response) => convertImageBlobToPng(await response.blob()));
     // Clipboard write must start in the menu click's user-activation stack.
@@ -115,7 +116,7 @@ async function downloadAsset(asset: EditorAgentContextAsset) {
     return false;
   }
   try {
-    const response = await readAssetBytes(asset.source, {
+    const response = await readAssetBytes(contextAssetMediaSrc(asset), {
       objectKey: asset.objectKey,
     });
     const blob = await response.blob();
@@ -189,7 +190,7 @@ export function useRightClickMenu({
             : action === EditorAgentRightClickAction.ReferenceImage &&
                 target.kind === 'asset' &&
                 target.asset.mediaType === 'image' &&
-                target.asset.source.trim()
+                contextAssetMediaSrc(target.asset).trim()
               ? (onReferenceImage?.(target.asset) ?? false)
             : action === EditorAgentRightClickAction.DownloadAsset &&
                 target.kind === 'asset'