Migration V1 to V2

Of course I step through the code. I do the call to UploadAsync and my dropbox shows me that the uploaded file is arrived.

But the call is never come back to the app.

In the webbrowsers Navigating-event I call my write method like

                    If bindDropbox.write(bindDropbox.BackupDestination) Is Nothing Then
                        MessageBox.Show("ERROR")
                    End If

bindDropbox is a seperate class and the write method is this

        Public Shared Async Function write(myFile As String) As System.Threading.Tasks.Task(Of Files.FileMetadata)
            Try

                Dim myReturn As Files.FileMetadata = Await bindDropbox.Client.Files.UploadAsync("/Backups/" + bindDropbox.Filename, WriteMode.Overwrite.Instance, body:=New MemoryStream(File.ReadAllBytes(myFile)))

                Return myReturn
            Catch ex As Exception
                Return Nothing
            End Try

        End Function

I have really no idea why UploadAsync isnt coming back.