Premier Rush won’t work on the iPad.

Hello I recently had to update my iPad with the new update of 15.7.1 and since then Premiere Rush will not load on my iPad. I've been onto the App Store and it doesn't require an update but all I get is a plain black screen. Sometimes I get the buffering symbol going round in a circle but most of the time it's just a blank black screen.

I can't see any of the videos I've created in the past and I can't upload and create new videos anymore. Why is this happening?