Storage problem

This is a great app, but it is posing a huge problem for me. It said this app required 2GB of storage, and now every time I draw a picture it freezes and then says I'm out of space. Its now day 3 and I am completely out of storage space and the app is taking up 10GB and I can't even go back into the drawing. And another thing is, my updated drawings are not saved on the cloud. So if I were to delete the app, redownload, and sign in, I would have to start over, because the old drawings are on there instead of the edited, and new ones I've made. I was even considering uninstalling this and cuthing my posses. And just yesterday I was drawing, and the app froze, and a couple mins Ilater the whole thing was erased and I had to start over. PLEASE HELP!!