diff --git a/src/clip-router.ts b/src/clip-router.ts
index 584fe84..fabfb6a 100644
--- a/src/clip-router.ts
+++ b/src/clip-router.ts
@@ -14,6 +14,8 @@ export interface VaultOps {
   listMarkdownFiles(folderPath: string): string[];
   read(filePath: string): Promise<string>;
   modify(filePath: string, content: string): Promise<void>;
+  // Parsed frontmatter from Obsidian's metadataCache; null when not indexed yet.
+  getFrontmatter(filePath: string): Record<string, unknown> | null;
 }
 
 export async function routeClip(
@@ -163,15 +165,30 @@ function sampleFrames(frames: string[], max: number): string[] {
   return Array.from({ length: max }, (_, i) => frames[Math.floor(i * step)]);
 }
 
+function escapeRegExp(s: string): string {
+  return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 async function findNoteByVideoId(
   videoId: string,
   folder: string,
   vaultOps: VaultOps,
 ): Promise<{ path: string; content: string } | null> {
   const files = vaultOps.listMarkdownFiles(folder);
+  // Obsidian's Properties editor re-serializes frontmatter and drops quotes, so
+  // an exact-substring match on `video_id: "x"` orphans the note forever. The
+  // metadataCache compares parsed values (quote-agnostic) without reading file
+  // contents; files the cache hasn't indexed yet (just-created notes) fall back
+  // to a quote-tolerant scan.
+  const pattern = new RegExp(`^video_id:\\s*"?${escapeRegExp(videoId)}"?\\s*$`, 'm');
   for (const filePath of files) {
+    const fm = vaultOps.getFrontmatter(filePath);
+    if (fm) {
+      if (String(fm.video_id ?? '') === videoId) return { path: filePath, content: await vaultOps.read(filePath) };
+      continue;
+    }
     const content = await vaultOps.read(filePath);
-    if (content.includes(`video_id: "${videoId}"`)) return { path: filePath, content };
+    if (pattern.test(content)) return { path: filePath, content };
   }
   return null;
 }
diff --git a/src/main.ts b/src/main.ts
index c3e12fb..df4edc1 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -157,6 +157,11 @@ export default class VaultAutopilotPlugin extends Plugin {
         if (!(file instanceof TFile)) throw new Error(`File not found: ${filePath}`);
         await this.app.vault.modify(file, content);
       },
+      getFrontmatter: (filePath) => {
+        const file = this.app.vault.getAbstractFileByPath(filePath);
+        if (!(file instanceof TFile)) return null;
+        return this.app.metadataCache.getFileCache(file)?.frontmatter ?? null;
+      },
     };
     this.server = createServer(
       port,
diff --git a/src/video-note.ts b/src/video-note.ts
index fd2d28b..23d266e 100644
--- a/src/video-note.ts
+++ b/src/video-note.ts
@@ -208,14 +208,28 @@ function parseSections(body: string): { head: string; sections: ParsedSection[]
 }
 
 function addDimension(frontmatter: string, kind: SectionKind): string {
-  return frontmatter.replace(/^(dimensions:\s*\[)([^\]]*)(\])/m, (_, open, inner, close) => {
-    const dims = inner.split(',').map((d: string) => d.trim()).filter(Boolean);
-    // Dedupe by kind, not by string — a zh note must not gain a second
-    // entry for the same dimension when a section is appended in en.
-    if (!dims.some((d: string) => labelToKind(d) === kind)) dims.push(headingLabel(kind));
+  // Dedupe by kind, not by string — a zh note must not gain a second
+  // entry for the same dimension when a section is appended in en.
+  const unquote = (d: string) => d.replace(/^"(.*)"$/, '$1');
+  const merged = (dims: string[]): string[] => {
+    if (!dims.some((d) => labelToKind(d) === kind)) dims.push(headingLabel(kind));
     const rank = (d: string) => { const k = labelToKind(d); return k ? KINDS.indexOf(k) : -1; };
-    dims.sort((a: string, b: string) => rank(a) - rank(b));
-    return `${open}${dims.join(', ')}${close}`;
+    return dims.sort((a, b) => rank(a) - rank(b));
+  };
+  const inline = /^(dimensions:\s*\[)([^\]]*)(\])/m;
+  if (inline.test(frontmatter)) {
+    return frontmatter.replace(inline, (_, open, inner, close) => {
+      const dims = merged(inner.split(',').map((d: string) => unquote(d.trim())).filter(Boolean));
+      return `${open}${dims.join(', ')}${close}`;
+    });
+  }
+  // Obsidian's Properties editor rewrites inline lists to block style (quoting
+  // items it considers special); keep that shape when appending.
+  return frontmatter.replace(/^dimensions:\n((?:[ \t]+- [^\n]*(?:\n|$))*)/m, (_, items: string) => {
+    const dims = merged(
+      items.split('\n').map((l) => unquote(l.replace(/^[ \t]+- /, '').trim())).filter(Boolean),
+    );
+    return `dimensions:\n${dims.map((d) => `  - ${d}`).join('\n')}\n`;
   });
 }
 
diff --git a/tests/clip-router.test.ts b/tests/clip-router.test.ts
index 43fd987..131c4b6 100644
--- a/tests/clip-router.test.ts
+++ b/tests/clip-router.test.ts
@@ -17,6 +17,7 @@ function makeVaultOps(): jest.Mocked<VaultOps> {
     listMarkdownFiles: jest.fn().mockReturnValue([]),
     read: jest.fn().mockResolvedValue(''),
     modify: jest.fn().mockResolvedValue(undefined),
+    getFrontmatter: jest.fn().mockReturnValue(null),
   };
 }
 
@@ -309,6 +310,71 @@ describe('routeClip — append to existing Great Videos note', () => {
     expect(result.notePath).toBe('Content Creation/Great Videos/note.md');
   });
 
+  test('finds a note whose frontmatter was re-serialized by Obsidian (unquoted video_id)', async () => {
+    const vaultOps = makeVaultOps();
+    (vaultOps.listMarkdownFiles as jest.Mock).mockReturnValue(['Content Creation/Great Videos/note.md']);
+    (vaultOps.read as jest.Mock).mockResolvedValue(existingNote.replace('video_id: "abc123"', 'video_id: abc123'));
+    const payload: ClipPayload = {
+      mode: 'hook',
+      frames: [Buffer.from('f1').toString('base64')],
+      video_title: 'My Video',
+      url: 'https://www.youtube.com/watch?v=abc123',
+      captured_at: '2026-05-31T00:00:00Z',
+    };
+    await routeClip(payload, { ...clipRules, hook: { ...hookClipRule, sopPath: '' } }, vaultOps);
+    expect(vaultOps.modify).toHaveBeenCalled();
+    expect(vaultOps.create).not.toHaveBeenCalled();
+  });
+
+  test('finds a note via metadataCache frontmatter without a content scan', async () => {
+    const vaultOps = makeVaultOps();
+    (vaultOps.listMarkdownFiles as jest.Mock).mockReturnValue(['Content Creation/Great Videos/note.md']);
+    (vaultOps.getFrontmatter as jest.Mock).mockReturnValue({ video_id: 'abc123' });
+    (vaultOps.read as jest.Mock).mockResolvedValue(existingNote);
+    const payload: ClipPayload = {
+      mode: 'hook',
+      frames: [Buffer.from('f1').toString('base64')],
+      video_title: 'My Video',
+      url: 'https://www.youtube.com/watch?v=abc123',
+      captured_at: '2026-05-31T00:00:00Z',
+    };
+    await routeClip(payload, { ...clipRules, hook: { ...hookClipRule, sopPath: '' } }, vaultOps);
+    expect(vaultOps.modify).toHaveBeenCalled();
+    expect(vaultOps.create).not.toHaveBeenCalled();
+  });
+
+  test('cached non-matching frontmatter skips the file without reading it', async () => {
+    const vaultOps = makeVaultOps();
+    (vaultOps.listMarkdownFiles as jest.Mock).mockReturnValue(['Content Creation/Great Videos/other.md']);
+    (vaultOps.getFrontmatter as jest.Mock).mockReturnValue({ video_id: 'zzz999' });
+    const payload: ClipPayload = {
+      mode: 'hook',
+      frames: [Buffer.from('f1').toString('base64')],
+      video_title: 'My Video',
+      url: 'https://www.youtube.com/watch?v=abc123',
+      captured_at: '2026-05-31T00:00:00Z',
+    };
+    await routeClip(payload, { ...clipRules, hook: { ...hookClipRule, sopPath: '' } }, vaultOps);
+    expect(vaultOps.read).not.toHaveBeenCalled();
+    expect(vaultOps.create).toHaveBeenCalled();
+  });
+
+  test('URL-based video keys with regex metacharacters match without crashing', async () => {
+    const vaultOps = makeVaultOps();
+    (vaultOps.listMarkdownFiles as jest.Mock).mockReturnValue(['Content Creation/Great Videos/tweet.md']);
+    (vaultOps.read as jest.Mock).mockResolvedValue(existingNote.replace('video_id: "abc123"', 'video_id: https://x.com/u/status/123'));
+    const payload: ClipPayload = {
+      mode: 'hook',
+      frames: [Buffer.from('f1').toString('base64')],
+      video_title: 'Tweet Video',
+      url: 'https://x.com/u/status/123?s=20',
+      captured_at: '2026-05-31T00:00:00Z',
+    };
+    await routeClip(payload, { ...clipRules, hook: { ...hookClipRule, sopPath: '' } }, vaultOps);
+    expect(vaultOps.modify).toHaveBeenCalled();
+    expect(vaultOps.create).not.toHaveBeenCalled();
+  });
+
   test('no existing note: creates new note in Great Videos with ## 🎬 内容 section', async () => {
     const vaultOps = makeVaultOps();
     (vaultOps.listMarkdownFiles as jest.Mock).mockReturnValue([]);
diff --git a/tests/contract.test.ts b/tests/contract.test.ts
index 5f5d540..8c4b72a 100644
--- a/tests/contract.test.ts
+++ b/tests/contract.test.ts
@@ -13,6 +13,7 @@ function mockVaultOps(): VaultOps {
     listMarkdownFiles: () => [],
     read: async () => '',
     modify: async () => {},
+    getFrontmatter: () => null,
   };
 }
 
diff --git a/tests/video-note.test.ts b/tests/video-note.test.ts
index 7cc9e77..93920cb 100644
--- a/tests/video-note.test.ts
+++ b/tests/video-note.test.ts
@@ -131,6 +131,20 @@ test('a hand-written unknown heading survives a merge untouched, placed after kn
   expect(r2.content.indexOf('## 我的分析')).toBeGreaterThan(r2.content.lastIndexOf('## 📸 截图'));
 });
 
+test('dimensions survive Obsidian Properties re-serialization to block-style YAML', () => {
+  // Obsidian's Properties editor rewrites `dimensions: [内容]` to a block list
+  // (quoting items it considers special). A later merge must still dedupe/append.
+  const reserialized = `---\ntype: video\nvideo_id: abc123\nvideo_url: https://www.youtube.com/watch?v=abc123\ntitle: Bee\ndimensions:\n  - "内容"\nanalyzed_at: 2026-07-01\n---\n\n# Bee\n\n## 🎬 内容\n\nbody\n`;
+  const r = mergeSection(reserialized, keyframeSection({ url: 'https://www.youtube.com/watch?v=abc123', platform: 'youtube', start: 45, end: 52, frameNames: ['k.png'] }));
+  const fm = r.content.match(/^---\n[\s\S]*?\n---/)![0];
+  expect(fm).toMatch(/dimensions:[\s\S]*内容/);
+  expect(fm).toMatch(/dimensions:[\s\S]*动效/);
+
+  const again = mergeSection(r.content, keyframeSection({ url: 'https://www.youtube.com/watch?v=abc123', platform: 'youtube', start: 100, end: 110, frameNames: ['k2.png'] }));
+  const fm2 = again.content.match(/^---\n[\s\S]*?\n---/)![0];
+  expect((fm2.match(/动效/g) || []).length).toBe(1);
+});
+
 test('hook section embeds the whole video from start (no end) + frames + 字幕', () => {
   const s = hookSection({ url: meta.videoUrl, platform: 'youtube', endSeconds: 15, frameNames: ['f1.png'], transcript: 'hello' });
   expect(s.kind).toBe('content');