I have found a bug in the apps analyse board. If i start entering a variation, if i click back a move, the app goes back one move from where you started, rather than going back one move from the position on the board. This results in you needing to click forward a number of moves to get back to where you were.
One other thing that would be nice to consider. The size of these arrows in the analyse board are tiny on my phone. I mean microscopic! It would be useful if the < and > buttons were finger sized. The << and >> buttons (for going to the very beginning or end of game) don't need to be so big, but the standard one move forward or back get used constantly, so would be really great if they were more prominent and easy to click.
Hope you guys are well! I have come back to play a few correspondence games after a long break!
EDIT: FYI I use a oneplus 5 andoid phone with a 5inch (approx) display