Help with adding assets to premier Rush IOS app

Hello! I am using Rush Premier iOS app on my iPad.  I am not able to add all the clips I need.  It says "preparing media" and appears to complete the action but does not add to timeline or assets.

Is there a limit to the number of assets you can bring into a timeline?

I was able to import 60 - but have way more I'd like to include.

Thank you!