Content URI is wrong when app restart

use a relative path, which is /Downloads/ADAMAS.mp3 or a full path, which is file:///storage/emulated/0/Downloads/ADAMAS.mp3

also you have to replace spaces by %20 in the filename, see my jukebox example here App Inventor Extensions: File | Pura Vida Apps

the assets are always read only, see also the following link

Taifun


Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by icon24 Taifun.