Good app, but theres problems.

I had this app a while ago and deleted it, not having anything to film. I recently downloaded it again because I got some figures I can move for stop motion. I tried exporting it to my camera roll and it says it works, but it never actually appears in my camera roll. Ive tried exporting it as a GIF file, but it is just exported as a picture of the first frame. I also cannot watch my video unless it is in edit mode, which doesnt show all the frames and makes it slow and choppy. Every time I try to watch it, it says theres an error about rendering the movie. Im very upset because Ive spent weeks making this movie and I cant even watch it. Ill update to five stars if this is all fixed. P.S.: I have an iPad Air two, so its not my device thats the problem.
-EDIT- I figured out the problem with not being able to watch it, and I was so relieved. I still cannot export my animation though. Im going to try to make some more space and try then, but overall its a pretty good app. I do recommend it, and I would say its the best stop motion app on the store. I just wish I could export it.

Scared to play about Stop Motion Studio, v7.1.1