diff --git a/scripts/check-native-shells.mjs b/scripts/check-native-shells.mjs
index dfab2a1aa..4e4941914 100644
--- a/scripts/check-native-shells.mjs
+++ b/scripts/check-native-shells.mjs
@@ -1252,26 +1252,32 @@ function assertH5HostBridgePayloadBoundaries() {
     {
       functionName: 'importHostTextFile',
       normalizer: 'normalizeHostBridgeImportTextResult',
+      preserveCancellation: true,
     },
     {
       functionName: 'importHostDocumentFile',
       normalizer: 'normalizeHostBridgeImportDocumentResult',
+      preserveCancellation: true,
     },
     {
       functionName: 'importHostImageFile',
       normalizer: 'normalizeHostBridgeImportImageResult',
+      preserveCancellation: true,
     },
     {
       functionName: 'captureHostImageFile',
       normalizer: 'normalizeHostBridgeImportImageResult',
+      preserveCancellation: true,
     },
     {
       functionName: 'importHostAudioFile',
       normalizer: 'normalizeHostBridgeImportAudioResult',
+      preserveCancellation: true,
     },
     {
       functionName: 'subscribeHostImageDrop',
       normalizer: 'normalizeHostBridgeImportImageResult',
+      preserveCancellation: false,
     },
   ]) {
     const functionSource = extractFunctionSource(
@@ -1283,6 +1289,24 @@ function assertH5HostBridgePayloadBoundaries() {
         `${importBoundary.functionName} must normalize imported file results with shared ${importBoundary.normalizer}`,
       );
     }
+    if (
+      importBoundary.preserveCancellation &&
+      (!functionSource.includes('isCancelledHostBridgeError(error)') ||
+        !functionSource.includes('return null;'))
+    ) {
+      throw new Error(
+        `${importBoundary.functionName} must preserve native user cancellation as null`,
+      );
+    }
+  }
+  const unsupportedHelperSource = extractFunctionSource(
+    h5HostBridgeSource,
+    'isUnsupportedHostBridgeError',
+  );
+  if (unsupportedHelperSource.includes("'cancelled'")) {
+    throw new Error(
+      'H5 HostBridge facade must not treat native user cancellation as unsupported capability',
+    );
   }
   for (const localMimeSet of [
     'HOST_BRIDGE_TEXT_MIME_TYPE_SET',
diff --git a/src/services/host-bridge/hostBridge.test.ts b/src/services/host-bridge/hostBridge.test.ts
index 1a2527138..f6df3597a 100644
--- a/src/services/host-bridge/hostBridge.test.ts
+++ b/src/services/host-bridge/hostBridge.test.ts
@@ -1488,8 +1488,10 @@ describe('hostBridge', () => {
 
   test('原生 App HostBridge 读取剪贴板结果按共享清单归一化', async () => {
     const oversizedText = 'a'.repeat(HOST_BRIDGE_CLIPBOARD_TEXT_MAX_LENGTH + 5);
+    let requestCount = 0;
     const invoke = vi.fn(
       async (_command: string, args?: Record<string, unknown>) => {
+        requestCount += 1;
         const request = (args as { request: { id: string } }).request;
         return {
           bridge: 'GenarrativeHostBridge',
@@ -1497,10 +1499,7 @@ describe('hostBridge', () => {
           id: request.id,
           ok: true,
           result: {
-            text:
-              invoke.mock.calls.length === 1
-                ? 42
-                : oversizedText,
+            text: requestCount === 1 ? 42 : oversizedText,
           },
         };
       },
@@ -2147,7 +2146,7 @@ describe('hostBridge', () => {
     expect(invoke).not.toHaveBeenCalled();
   });
 
-  test('原生 App 宿主取消导入音频时回退为 false', async () => {
+  test('原生 App 宿主取消导入音频时返回 null', async () => {
     const invoke = vi.fn(
       async (_command: string, args?: Record<string, unknown>) => {
         const request = (args as { request: { id: string } }).request;
@@ -2174,10 +2173,10 @@ describe('hostBridge', () => {
       },
     };
 
-    await expect(importHostAudioFile()).resolves.toBe(false);
+    await expect(importHostAudioFile()).resolves.toBeNull();
   });
 
-  test('原生 App 宿主取消导入文本时回退为 false', async () => {
+  test('原生 App 宿主取消导入文本时返回 null', async () => {
     const invoke = vi.fn(
       async (_command: string, args?: Record<string, unknown>) => {
         const request = (args as { request: { id: string } }).request;
@@ -2204,10 +2203,10 @@ describe('hostBridge', () => {
       },
     };
 
-    await expect(importHostTextFile()).resolves.toBe(false);
+    await expect(importHostTextFile()).resolves.toBeNull();
   });
 
-  test('原生 App 宿主取消导入文档时回退为 false', async () => {
+  test('原生 App 宿主取消导入文档时返回 null', async () => {
     const invoke = vi.fn(
       async (_command: string, args?: Record<string, unknown>) => {
         const request = (args as { request: { id: string } }).request;
@@ -2234,7 +2233,7 @@ describe('hostBridge', () => {
       },
     };
 
-    await expect(importHostDocumentFile()).resolves.toBe(false);
+    await expect(importHostDocumentFile()).resolves.toBeNull();
   });
 
   test('原生 App 宿主导入文档返回畸形 payload 时回退为 false', async () => {
@@ -2303,7 +2302,7 @@ describe('hostBridge', () => {
     await expect(importHostAudioFile()).resolves.toBe(false);
   });
 
-  test('原生 App 宿主取消导入图片时回退为 false', async () => {
+  test('原生 App 宿主取消导入图片时返回 null', async () => {
     const invoke = vi.fn(
       async (_command: string, args?: Record<string, unknown>) => {
         const request = (args as { request: { id: string } }).request;
@@ -2330,7 +2329,37 @@ describe('hostBridge', () => {
       },
     };
 
-    await expect(importHostImageFile()).resolves.toBe(false);
+    await expect(importHostImageFile()).resolves.toBeNull();
+  });
+
+  test('原生 App 宿主取消拍摄图片时返回 null', async () => {
+    const invoke = vi.fn(
+      async (_command: string, args?: Record<string, unknown>) => {
+        const request = (args as { request: { id: string } }).request;
+        return {
+          bridge: 'GenarrativeHostBridge',
+          version: 1,
+          id: request.id,
+          ok: false,
+          error: {
+            code: 'cancelled',
+            message: 'camera capture cancelled',
+          },
+        };
+      },
+    );
+    window.history.replaceState(
+      null,
+      '',
+      nativeAppPath(['file.captureImage']),
+    );
+    window.__TAURI__ = {
+      core: {
+        invoke: asTauriInvoke(invoke),
+      },
+    };
+
+    await expect(captureHostImageFile()).resolves.toBeNull();
   });
 
   test('原生 App 宿主取消扫码时不触发 H5 摄像头回退', async () => {
diff --git a/src/services/host-bridge/hostBridge.ts b/src/services/host-bridge/hostBridge.ts
index ab698d07d..a3b53c76c 100644
--- a/src/services/host-bridge/hostBridge.ts
+++ b/src/services/host-bridge/hostBridge.ts
@@ -173,11 +173,14 @@ function isUnsupportedHostBridgeError(error: unknown) {
   return (
     error instanceof Error &&
     (error.name === 'unsupported_method' ||
-      error.name === 'unsupported_capability' ||
-      error.name === 'cancelled')
+      error.name === 'unsupported_capability')
   );
 }
 
+function isCancelledHostBridgeError(error: unknown) {
+  return error instanceof Error && error.name === 'cancelled';
+}
+
 function normalizeHostCapabilities(values: unknown): HostBridgeCapability[] {
   if (!Array.isArray(values)) {
     return [];
@@ -994,6 +997,9 @@ export async function importHostImageFile() {
       ),
     ) ?? false;
   } catch (error) {
+    if (isCancelledHostBridgeError(error)) {
+      return null;
+    }
     if (isUnsupportedHostBridgeError(error)) {
       return false;
     }
@@ -1015,6 +1021,9 @@ export async function captureHostImageFile() {
       ),
     ) ?? false;
   } catch (error) {
+    if (isCancelledHostBridgeError(error)) {
+      return null;
+    }
     if (isUnsupportedHostBridgeError(error)) {
       return false;
     }
@@ -1036,7 +1045,7 @@ export async function scanHostQrCode() {
       );
     return normalizeHostBridgeQrCodeValue(result?.value) ?? false;
   } catch (error) {
-    if (error instanceof Error && error.name === 'cancelled') {
+    if (isCancelledHostBridgeError(error)) {
       return null;
     }
     if (isUnsupportedHostBridgeError(error)) {
@@ -1060,6 +1069,9 @@ export async function importHostTextFile() {
       ),
     ) ?? false;
   } catch (error) {
+    if (isCancelledHostBridgeError(error)) {
+      return null;
+    }
     if (isUnsupportedHostBridgeError(error)) {
       return false;
     }
@@ -1081,6 +1093,9 @@ export async function importHostDocumentFile() {
       ),
     ) ?? false;
   } catch (error) {
+    if (isCancelledHostBridgeError(error)) {
+      return null;
+    }
     if (isUnsupportedHostBridgeError(error)) {
       return false;
     }
@@ -1102,6 +1117,9 @@ export async function importHostAudioFile() {
       ),
     ) ?? false;
   } catch (error) {
+    if (isCancelledHostBridgeError(error)) {
+      return null;
+    }
     if (isUnsupportedHostBridgeError(error)) {
       return false;
     }