Android Question AjWebKit refuse to upload a file

Sub ShowFile_Chooser (FilePathCallback As Object, FileChooserParams As Object)
   cc.Initialize("CC")
   cc.Show("*/*", "Choose File")
   Wait For CC_Result (Success As Boolean, Dir As String, FileName As String)
   Dim jo As JavaObject = Me
   If Success Then
       Log(FileName)
       File.Copy(Dir, FileName, Starter.Provider.SharedFolder, "TempFile")
       jo.RunMethod("SendResult", Array(Starter.Provider.GetFileUri("TempFile"), FilePathCallback))
   Else
       jo.RunMethod("SendResult", Array(Null, FilePathCallback))
   End If
End Sub