fileloader example gives error on m1 macos

[SimonShapiro]

file-picker-upload-progress.py gives

Exception: Unsupported command: getUploadUrl on upload.

Also, the documentation is very unclear as to where the files have gone, so that they can be used again later.

[SimonShapiro]

Interestingly, when I use it as a web app with view=flet.WEB_BROWSER, it is fine and the file go to the relative directory.