wolfram cloud - Upload a file using a WolframCloud WebForm

I tried to create a Webform in WolframCloud that asks/browses for a file and then uploads it to a specific folder. The following are the directions I investigated but it does not work:

CloudDeploy @
FormFunction[
"fname" -> "String", 
  Module[{st1, st2},

    st1 = "E:\\math9\\Personal Lessons\\" <> #fname <> ".xls";
    st2 = #fname <> ".xls";
    {st1, st2, CopyFile[st1, CloudObject[st2]]}
    ] &
  ]

I also tried directions like this:

CloudDeploy @
 FormFunction[
  "fname" -> Interpreter[Restricted["UploadedFile", "XLS"]],

  {#fname}
  ]

but it looks this does not work because it always produces the following error:

The function isn't even evaluated. Can anybody help on how to do this or state that it is not yet possible in the WolframCloud?

Kind regards