[Vibraphon]

Thank you for testing!
The mp3-files are missing because I stored the backup without audio to reduce the file size.
I thought, the database would know if the backup-option "no audio" is used.

But the real reason of the problems seem to be that something stops the restore process just before finish.
Maybe there is not enough memory. I don't know.
This only happens on two tablets using Android 5.1.1.

Is there a possibility to force an database update, even if there is an error?
Currently nearly all songs are on the tablet, but we can't open any of them!