Rush won't render, sync, or save projects

So many functions not working!!! I'm a fluent Premiere user, using Rush for the first time, in heavy consultation with the Adobe Community Support solutions to common problems. On a Samsung S20FE with 8gb RAM and over 40GB of free space. The video assets in my project are less than 500mb. Here's a list of issues. Surprisingly the editing interface worked perfectly, it's just EVERYTHING ELSE.

• Trying to go from the editing interface back to the app home screen crashes the app. It hangs infinitely with the page loading circle. I have to force quit the app and reopen it.
• Exporting always fails. The film is just a minute long, I'm exporting at 720p, and I can't even get past 1%. I've left it for hours, no progress made.
• So apparently the projects need to be fully sync'd before an export can occur. This is according to a response by an Adobe Community Professional. If true, why is this not mentioned in-app upon export-attempt? Moreover, why is the sync feature turned off by default, if its apparently necessary for such an essential function as exporting?
• After turning sync on, and waiting til the little blue upload circle is complete, I get a red exclamation mark error. Screenshot attached. It says the most likely cause is an interpretation from another device. I do not have Rush on another device. Also, I do not have another device. There is seemingly no way to resolve this error. I've force-quit the app, restarted my phone, and reopened Rush. Several times. Syncing won't complete. I can"t proceed with export.
• One Adobe Community Professional suggested signing out of the Adobe accound and signing back in. I did so. My project was gone. Entirely gone. Back to the first screen where the only way forward is to make a new project. What gives?

Adobe, this app is RUBBISH. It's riddled with bugs, just like Premiere Pro has become since the last big update. What am I paying my subscription for? To have my time thoroughly wasted???