Hmmm… I’ve not seen any crashes that are related to the music portion lately… I do know you had your music on an external drive though, maybe it’s because of that.
The files are stored in /sdcard/Android/data/com.autosenseapp.com/. There are two folders, albumthumbs and artistthumbs. If things are downloading correctly they should be full of files. I think currently it’s set to redownload new images every 30 days or so, but I’m going to change that to only download them once.