I did some more tests. It looks like sharing works in all combinations: public link (anonymous guest), another NC user. Open, edit works for owner and user with shared access (shared folder, group folder and direct share)
But in my installation I can’t create new documents - after I created and edited a doc (even if I manually “save” the doc before closing with 
) - the docs can’t be open after it, and if I download the doc the file opens empty in local LibreOffice. the result is the same for ods and odt files. Everything works if I upload new file and edit them using Collabora…
Maybe somebody could review and confirm my testing. (NC23.0.2, collabora 21.11.2.4 both docker)
UPDATE: it takes little time - when you create new doc you must wait until it reaches “saved” state
- should be not a problem with real docs but first automatic save occurs maybe 1-2 Minutes after you start editing, so testing with really short edits might result in corrupt files. If you press save and wait 10-20 seconds you should be safe and the file is valid and can be open but the author and user with share…
floppy disk icon shown “unsaved” state
checkmark shows “saved” state