Thanks a lot, TIM.
Now I know what happened:
Web .GotFile fileName gives you the full path on the device storage up to the file name.
That's good for Image .Picture to show the photo (because it requires the full path).
But, according to your advice, I have to give File . Delete the file name I ordered to convert, preceded by a forward slash.
I compiled it and it works: It uploads to the cloud the converted file, and deletes it from ASD.
But another problem arised: It works perfectly in a tablet with Android11, but in other tablet wit an older Android version it gives an Error 1104: Unable to complete the given request with the file....with the specified URL....
Its strange for me because, despite the error, the converted file is uploaded, and then deleted from device.
And there is no such an error displayed on the device with Android11