I've been using this app the last two years or so. My experience was five star until about a week ago when every piece I've worked on is no longer available to edit. All of my finished work is already backed up, so I haven't lost anything completed. However I've had several pictures that I'll never be able to finished because I can't finish them in one session, and the app now has this glitch. I can no longer use this app until this changes, because sketching is now near impossible to finish.