my core is running on NAS for long, recently it was rebooted unintentionally due to power interrupt. After that, i find quite a number of albums have lost their thumbnail, and shows as empty disc default thumbnail only. this happens on my iPad / mobile / PC together. So i wonder the database has problem.
How can i fix the database, or force the core to rescan and rebuild the thumbnail from the music file again ?
Meanwhile i have to click into each album, edit, rescan album, then the thumbnail will be back.
But i guess there is around hundreds album need to fix.