While my phone was ded I was trying out medibang and my experience was that I lost my progress twice. It was on another drawing I was doing for a contest but it gave me indescribable pain nonetheless. It's also not like I didn't loose my progress on this canvas. I would've been able to upload way sooner if I wasn't trying to figure out how to not loose progress. What I've found is that restrict it's internet usage, turn off auto sync and click save every 2 minutes.
Sketches I did to test stuff on Krita. As a devout FireAlpaca user it was. interesting. Probably objectively better but so confusing for my poor little idiot brain.