Didn't even know this was possible until this tutorial Thank you!!! Now I've got so many "Animation" ideas I wanna try! Does this work for making body parts move smoothly?!
No this is just an in app thing you can do with pretty much any art app with a selection tool, duplicate, and layering ability, you'd need a separate app for animation
There's another way to do it tho. If it's a made from scratch illustration and your doing the eyes, you can do the whites of the eyes, and then use like a folder or smthn and when you want to see how the moving eyes will look, you go onto the folder itself and you use transform and move it around.