So I'm testing on my Android phone (HTC 10) running Android 7.0. I am able to link a .mscz file on the internal device storage (/storage/emulated/0/Download) and when I tap the button, Musescore Songbook is loaded and the file is shown. So the feature seems to work for me. Where is the file that you are linking to and what kind of file is it?
Thanks,
Mike
Thanks,
Mike