# Send files in chat

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Users can transfer files in chat during the session.

> Zoom deletes files sent via in-session chat when the session ends.

Enable [send files via in-session chat](/docs/build/account/#in-session-advanced) in your Video SDK account portal settings and configure the following settings.

-   **Only allow specified file types** - Select to allow only specific file types and enter the file extensions in the text box, separated by commas.
-   **Maximum file size** - Select to limit the file size to 2048 MB.

Check if the file transfer feature is enabled.

```swift
let ret = ZMVideoSDK.shared().getSessionInfo().isFileTransferEnabled()
```

```objectivec
BOOL ret =  [[[ZMVideoSDK sharedVideoSDK] getSessionInfo] isFileTransferEnabled];
```

Get the list of allowed file types that you can transfer.

```swift
let ret = ZMVideoSDK.shared().getSessionInfo().getTransferFileTypeWhiteList()
```

```objectivec
NSString *ret =  [[[ZMVideoSDK sharedVideoSDK] getSessionInfo] getTransferFileTypeWhiteList];
```

Get the maximum file size to transfer.

```swift
let ret = ZMVideoSDK.shared().getSessionInfo().getMaxTransferFileSize()
```

```objectivec
unsigned long long  ret =  [[[ZMVideoSDK sharedVideoSDK] getSessionInfo] getMaxTransferFileSize];
```

Send files to all users in the current session.

```swift
let ret = ZMVideoSDK.shared().getSessionInfo().transferFile(filePath: String)
```

```objectivec
ZMVideoSDKErrors ret =  [[[ZMVideoSDK sharedVideoSDK] getSessionInfo] transferFile:self.filePathTextF.stringValue];
```

Send files to a certain user in the session.

```swift
// Locate the user that you would like to send the file to.
let receiver: ZMVideoSDKUser

// Send file directly.
let ret = receiver.transferFile(filePath: String)
```

```objectivec
ZMVideoSDKErrors ret =  [_receiverUser transferFile:self.filePathTextF.stringValue];
```

Cancel sending files.

```swift
// getCurrentSendFileObj is a user-defined method, to retrieve the sending file.
let sendFile: ZMVideoSDKSendFile = getCurrentSendFileObj()
let ret = sendFile.cancelSend()
```

```objectivec
ZMVideoSDKSendFile *send = [self getCurrentSendFileObj]; // getCurrentSendFileObj is a user-defined method, to retrieve the sending file.
ZMVideoSDKErrors ret =  [send cancelSend];
```

Start receiving files.

```swift
// getCurrentReceiveFileObj is a user-defined method, to retrieve the receiving file.
let receiveFile: ZMVideoSDKReceiveFile = getCurrentReceiveFileObj()

let fileDomain = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).map(\.path).last
let filePath = "<File path to receive>"
let downloadFilePath = "\(fileDomain)/\(filePath.count > 0 ? filePath : receiveFile.fileName)"

if (receiveFile) {
  let ret = receiveFile.startReceive(downloadFilePath)
  }
```

```objectivec
ZMVideoSDKReceiveFile *receive = [self getCurrentReceiveFileObj]; //getCurrentReceiveFileObj is a user-defined method, to retrieve the receiving  file.

NSString *fileDomain = [NSSearchPathForDirectoriesInDomains(NSDownloadsDirectory, NSUserDomainMask, YES).lastObject copy];
NSString *filePath = @"<File path to receive>";
NSString *downloadFilePath = [NSString stringWithFormat:@"%@/%@",fileDomain,filePath.length>0?filePath:receive.fileName];

if (receive) {
  ZMVideoSDKErrors ret =  [receive startReceive:downloadFilePath];
  } else {
    NSLog(@"receive is null");
  }
```

Cancel receiving files.

```swift
// getCurrentReceiveFileObj is a user-defined method, to retrieve the receiving file.
let receiveFile: ZMVideoSDKReceiveFile = getCurrentReceiveFileObj()

if (receiveFile) {
  let ret = receiveFile.cancelReceive()
  }
```

```objectivec
ZMVideoSDKReceiveFile *receive = [self getCurrentReceiveFileObj]; // getCurrentReceiveFileObj is a user-defined method, to retrieve the receiving  file.
  if (receive) {
    ZMVideoSDKErrors ret =  [receive cancelReceive];
  } else {
    NSLog(@"receive is null");
  }
```

## File transfer callbacks

Be sure that you have [set up a delegate for callback events](/docs/video-sdk/macos/integrate/#implement-a-delegate) to receive file transfer callbacks.

Get notified when you transfer a file.

```swift
func onSendFile(_ sendFile: ZMVideoSDKSendFile!, status: ZMVideoSDKFileTransferStatus) {
  // Get the transfer status of the file and the file content here.
  }
```

```objectivec
- (void)onSendFile:(ZMVideoSDKSendFile *)sendFile status:(ZMVideoSDKFileTransferStatus)status
{
  // Get the transfer status of the file and the file content here.
}
```

Get notified when you receive a file from other users.

```swift
func onReceiveFile(_ receiveFile: ZMVideoSDKReceiveFile!, status: ZMVideoSDKFileTransferStatus) {
  // Get the transfer status of the file and the file content here.
  }
```

```objectivec
-(void)onReceiveFile:(ZMVideoSDKReceiveFile *)receiveFile status:(ZMVideoSDKFileTransferStatus)status
{
  // Get the transfer status of the file and the file content here.
}
```