File size

I used premiere rush mobile on iPhone for a long time. But I wanted better mic quality and started to use it on my Mac book. But it's a lot more complicated and I returned to using mobile. I keep running into the same problems from years ago. My videos won't download after a certain size and the app crashes when the file is large. Right now the file I'm working on is 500 mb and I can't work on it for more than 1 minute straight. Has anyone else who's had this problem found a solution?