uploadFileDeferred method
Implementation
Future<FileUpload> uploadFileDeferred(String path, Stream<Uint8List> dataStream, int size) async {
final uploader = MeshagentFileUpload.deferred(room: room, path: path, dataStream: dataStream, size: size);
uploader.addListener(notifyListeners);
_attachmentUploads.add(uploader);
notifyListeners();
return uploader;
}