Premier Rush keeps crashing when I try to render

I am trying to render a video that is a 662 MB file on my Iphone and it says it cannot render it. I then moved to my Macbook to try to do it there and installed the latest version of Premier Rush but it keeps crashing every few minutes. If I try to share the file it says that some of the media locations cannot be found in the file and that sharing or rendering may cause the file to be corrupt. I have rendered videos of this size before and never had an issues. I'm new to Premiere Rush and I'm not a master video editor or anything, but I wanted to make better videos and paid for a Pro subscription, but what't the point if I can't render it? Please help!!  Thank you.