[deleted] two years have passed, and I still find it incredibly tedious to use. It's only good to quickly rotate or crop the screenshot.
I often use drawing or highlighting things on the screenshots, and now I'm at the point I never use GrapheneOS' app for this:
1) "undo" undoes EVERYTHING you do with a tool, not just last scribble(s) like Google's app does
2) it always defaults to 50% opacity, which is kind of infuriating if I had to several times undo (losing all drawing), choose tool again, choose opacity 100% again, make a small mistake because screen is tiny, undo again (losing ALL drawing again), choose drawing tool, having to set the opacity from 50% to 100% again.
I just... can't. Now it's either Aves or Google Photos for me.