public async Task <bool> Upload(FileStream stream, string filenanme, Publicacion obj) { conexion = new Conexion(); string link = ""; if (stream != null) { var auth = new FirebaseAuthProvider(new FirebaseConfig(conexion.Firekey())); var a = await auth.SignInWithEmailAndPasswordAsync(conexion.AthEmail(), conexion.AthPassword()); var cancellation = new CancellationTokenSource(); var task = new FirebaseStorage( conexion.Storge(), new FirebaseStorageOptions { AuthTokenAsyncFactory = () => Task.FromResult(a.FirebaseToken), ThrowOnCancel = true // when you cancel the upload, exception is thrown. By default no exception is thrown }) .Child("Publicaciones") .Child(filenanme) .PutAsync(stream, cancellation.Token); link = await task; } try { Task tarea2 = Task.Run(() => Create_Publicacion(obj, link)); } catch (Exception ex) { Console.WriteLine("Exception was thrown: {0}", ex); } return(true); }