update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/application-dev/reference/apis/Readme-EN.md

@@ -233,6 +233,7 @@
   - [@ohos.data.ValuesBucket (Value Bucket)](js-apis-data-valuesBucket.md)
 
 - File Management
+  - [@ohos.file.cloudSyncManager (Device-Cloud Synchronization Management)](js-apis-file-cloudsyncmanager.md)
   - [@ohos.file.environment (Directory Environment Capability)](js-apis-file-environment.md)
   - [@ohos.file.fileAccess (User File Access and Management)](js-apis-fileAccess.md)
   - [@ohos.file.fileExtensionInfo (User File Extension Information)](js-apis-fileExtensionInfo.md)

en/application-dev/reference/apis/js-apis-file-cloudsyncmanager.md

+# @ohos.file.cloudSyncManager (Device-Cloud Synchronization Management)
+
+The **cloudSyncManager** module provides APIs for changing the cloud and device service status and notifying the data changes. 
+
+> **NOTE**
+>
+> - The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+> - The APIs of this module are system APIs and cannot be called by third-party applications.
+> - The APIs of this module support processing of error codes. For details, see [File Management Error Codes](../errorcodes/errorcode-filemanagement.md).
+
+## Modules to Import
+
+```js
+import cloudSyncManager from '@ohos.file.cloudSyncManager';
+```
+
+## cloudSyncManager.changeAppCloudSwitch
+
+changeAppCloudSwitch(accountId: string, bundleName: string, status: boolean): Promise<void>;
+
+Changes the device-cloud file synchronization switch for an application. This API uses a promise to return the result.
+
+**System capability**: SystemCapability.FileManagement.DistributedFileService.CloudSyncManager
+
+**Parameters**
+
+| Name    | Type  | Mandatory| Description|
+| ---------- | ------ | ---- | ---- |
+| accountId | string | Yes  | Account ID.|
+| bundleName | string | Yes  | Bundle name of the application.|
+| status | boolean | Yes  | State of the cloud-device file synchronization switch to set. The value **true** means to enable this function; the value **false** means the opposite.|
+
+**Return value**
+
+| Type                 | Description            |
+| --------------------- | ---------------- |
+| Promise<void> | Promise used to return the result.|
+
+**Example**
+
+  ```js
+  let accountId = "testAccount";
+  let bundleName = "com.example.bundle";
+  cloudSyncManager.changeAppCloudSwitch(accountId, bundleName, true).then(function() {
+      console.info("changeAppCloudSwitch successfully");
+  }).catch(function(err) {
+      console.info("changeAppCloudSwitch failed with error message: " + err.message + ", error code: " + err.code);
+  });
+  ```
+
+## cloudSyncManager.changeAppCloudSwitch
+
+changeAppCloudSwitch(accountId: string, bundleName: string, status: boolean, callback: AsyncCallback<void>): void;
+
+Changes the device-cloud file synchronization switch for an application. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.FileManagement.DistributedFileService.CloudSyncManager
+
+**Parameters**
+
+| Name    | Type  | Mandatory| Description|
+| ---------- | ------ | ---- | ---- |
+| accountId | string | Yes  | Account ID.|
+| bundleName | string | Yes  | Bundle name of the application.|
+| status | boolean | Yes  | State of the cloud-device file synchronization switch to set. The value **true** means to enable this function; the value **false** means the opposite.|
+| callback | AsyncCallback<void> | Yes  | Callback invoked to return the result.|
+
+**Example**
+
+  ```js
+  let accountId = "testAccount";
+  let bundleName = "com.example.bundle";
+  cloudSyncManager.changeAppCloudSwitch(accountId, bundleName, true, (err) => {
+    if (err) {
+      console.info("changeAppCloudSwitch failed with error message: " + err.message + ", error code: " + err.code);
+    } else {
+      console.info("changeAppCloudSwitch successfully");
+    }
+  });
+  ```
+## cloudSyncManager.notifyDataChange
+
+notifyDataChange(accountId: string, bundleName: string): Promise<void>;
+
+Notifies the cloud and device services of the application data change in the cloud. This API uses a promise to return the result.
+
+**System capability**: SystemCapability.FileManagement.DistributedFileService.CloudSyncManager
+
+**Parameters**
+
+| Name    | Type  | Mandatory| Description|
+| ---------- | ------ | ---- | ---- |
+| accountId | string | Yes  | Account ID.|
+| bundleName | string | Yes  | Bundle name of the application.|
+
+**Return value**
+
+| Type                 | Description            |
+| --------------------- | ---------------- |
+| Promise<void> | Promise used to return the application data change in the cloud.|
+
+**Example**
+
+  ```js
+  let accountId = "testAccount";
+  let bundleName = "com.example.bundle";
+  cloudSyncManager.notifyDataChange(accountId, bundleName).then(function() {
+      console.info("notifyDataChange successfully");
+  }).catch(function(err) {
+      console.info("notifyDataChange failed with error message: " + err.message + ", error code: " + err.code);
+  });
+  ```
+
+## cloudSyncManager.notifyDataChange
+
+notifyDataChange(accountId: string, bundleName: string, callback: AsyncCallback<void>): void;
+
+Notifies the cloud and device services of the application data change in the cloud. This API uses a promise to return the result.
+
+**System capability**: SystemCapability.FileManagement.DistributedFileService.CloudSyncManager
+
+**Parameters**
+
+| Name    | Type  | Mandatory| Description|
+| ---------- | ------ | ---- | ---- |
+| accountId | string | Yes  | Account ID.|
+| bundleName | string | Yes  | Bundle name of the application.|
+| callback | AsyncCallback<void> | Yes  | Callback invoked to return the application data change in the cloud.|
+
+**Example**
+
+  ```js
+  let accountId = "testAccount";
+  let bundleName = "com.example.bundle";
+  cloudSyncManager.notifyDataChange(accountId, bundleName, (err) => {
+    if (err) {
+      console.info("notifyDataChange failed with error message: " + err.message + ", error code: " + err.code);
+    } else {
+      console.info("notifyDataChange successfully");
+    }
+  });
+  ```