This only because fossify hangs on my photos anymore. Black thumbnails, etc. I've cleared both cache and storage then uninstalled and reinstalled. No difference.
Update it from the github. They released some bug in the version in the repos, and the fix hadn't yet made it there yet. At least that was the case a couple weeks ago. Updating from github fixed that problem for me immediately.
I used to use Simple Gallery and later Fossify Gallery.
Now that I have a device new enough for Accrescent to work on it I discovered Aves Gallery Libre.
It's much nicer and polished in many ways but I do miss some features sometimes
The Fossify suite (like the gallery app that was linked to in the OP) was forked from this. Simple Mobile had been bought out by an ad company or something last year, so the community moved onto Fossify. Note how Simple Gallery has not been updated in over a year, and was removed from F-Droid.