I have a 20.04.2 Ubuntu server with KDE on top.
Standard Bare Metal install of Nextcloud on Apache. Everything else is running fine. Server is reachable and running latest 20.0.8 and all checks passed.
I can create a new document just fine. I can then edit it one time. After that I can open it but nothing is there. And if I add something I cannot save.
If I connect to a demo server it is all well. It does lead one to think it is a permissions issue. Collabora can’t read or write to the data folder?