Hello @jv2007
Please clarify the connector app version. Is it v.9.2.0? If so, probably you have faced the same situation that we have discussed in this thread: Nextcloud 28.05 onlyoffice plugin 9.2.0 bug - #16 by Alexandre
We are working on the fix already. it will be included in the next version of the connector app. Meanwhile, we have prepared test build that should resolve the issue. The alternative solution is to use the connector app v.9.1.2 or older version.