Hey, it is a thing you can do, I just haven’t gotten around to documenting it properly yet. The way to do it is locate the Session Data folder (it should be at: Documents/SophiesCubes/SessionData)
put your images in there, and the next time you open the app, the images will be loaded and can be applied when creating a cube in a new session.
If you have any problems with that just let me know, I’ll do what I can to help :)