This app is great I love it but – Stop Motion Studio Pro Review

This app is great but when I do want to delete a frame I can’t undo frames and when I don’t undo the frame right after I make that frame I can’t undo it so when I just made a stop motion that took a hour I ruined it so I tried to delete the from but I could not please help
Review by hiw are you123 on Stop Motion Studio Pro.