Versions of files on external storage

Good day. I am using NextCloud version 21.0.0 with Ubuntu 20.04.2. An external storage is connected to NextCloud (admin - settings - administration - external storages). If I create a text file on external storage and edit it with Only Office, then I don’t see any versions of that file.
Is this how it should be or have I configured something wrong?

If you create and edit a file on local storage, then the file versions are displayed correctly.