I’m having the same problem as in @JasonBayton’s screenshot above.
I have uninstalled and reinstalled a couple of times, and can’t currently reproduce it reliably… however, I have noticed that in the accounts section, my username on my server has been replaced with a GUID instead of my actual username…
When I go to Auto Upload settings, to choose a remote folder, I am unable to do so. I think this is where it was crashing previously… Currently it redirects me to a login screen, with my server hostname and username pre-populated (and read-only, annoyingly for this use case!). However, the username that gets pre-populated is the GUID and not my actual username - and I can’t log into the server using these credentials, so the whole thing just fails.
In the meantime I can get an older version of the Nextcloud client from F-Droid… but 2.0.0-rc2 does seem to be very broken for me.