suggestions for the overall function of the app

i would like an "undo" button for the app. There have been a few times where I placed an image in the background of a layered set and wished I could "undo" the previous action. The only current option being to remove every layer, or move them out of position to access the desired lower leveled image.

also, perhaps this is option is already available, but to reload into imagi a previously made and saved image.

I'm not sure if this is a glitch for anyone else, but I'm finding the "Clear media" function getting stuck. Admittedly, this is probably me, I have a habit of constructing my image first and remembering to clear the media last. But, when I hit the clear media function, the screen locks and all other functions are nonreponsive.