Project not Synching

Hi there, 

One of my projects on my mobile phone on Rush will not synch. I turn on synch for the project and nothing happens, even if I leave the app open for hours. I've tried it with and without cellular synch turned on, on WiFi, not on WiFi, I've turned synch on and off, restarted the app, opened and closed the project, signed out and back in, nothing seems to work. It's set to synch with the cloud icon, but simply appears to make no effort to upload media. 

I've synced previous projects before without issue, and tested synching another project and it immediately started uploading media. 

O/S is Android 11

Phone is Samsung Galaxy S20FE