Oh theres this site called ufiles, i don't really know how t works but i know another way too make a file with your progress in it!

When you click the pencil at the top of the flipanim screen scroll down and yu'll see a clog button that called a "setting" click on it and at the very top it says Load/Save project on disk if you want too load then click the one with a green arrow pointing up and if you want to save it then press the red arrow pointing downwards! I hope it helped ^u^

Np :)