Nextcloud version history is a great thing. It would be awesome to integrate an setting to show diff between different versions (at least between last version and an older one).
If possible it would be nice to show diffs not only for plain text files, but also for pdf or office files.
LibreOffice offers and compare document feature, so if there is LOOL activated, it should be possible to run the command and open the compared document.
For pdf I use diffpdf but I’m sure there are some command line tools out there.
This feature would also be nice to have when you share documents with someone else. So it will be easier to see changes for someone else (shared link).