I've been looking into starting animation for a while now, and, as a long time user of Windows 10 Sketchbook, was happy to see that your Desktop Edition had a Flipbook tool. However, after playing around with the Desktop Edition on several different projects, I found it worked much too differently and much less smoothly from Windows 10 for me to actually get anything decent done. I think if you were to add the Flipbook/Animation ability to Windows 10 edition, it would make the program even better than it already is and entice more new users to try it out!