Question
Indesign 2020 (15.0.1), Mac OS v10.14.6, Saving files to server, opening from server.
When saving an InDesign file to server, we get the following error.

We get this whether we do “Save” new document or “Save As”.
If we try to save over another file on the server, same name, as in save as. It will sometimes delete the orginal file.
We also have issues when opening a file. It always takes 2 attempts to open. First time will get the following message:

Attempt to open this again, and it will open.