Premiere rush playback just black screen

I was working a project in premiere rush last week. I went from working on it with WiFi to working on it using cell data (no wifi). All of a sudden, when working on the project using data, I couldn't make any more changes. So I restarted the app and all my work was lost. Ever since then, everything I upload just turns out as a black screen. Audio works fine. I deleted the app and redownloaded it to get the latest version and that didn't work. I am using the mobile version on the newest iOS