My Nextcloud instance broke again-again a month ago where the iOS app could not connect anymore… No helpful error code or message. I have never really been satisfied with their products, it always seemed slow and buggy and they have thousands of open issues on their repos. I used it for photos, online file storage/sharing and for messaging / video chat. I have now replaced it with Owncloud + Immich + Signal (not self hosted) and i’m very satisfied. Owncloud is just way snappier and no bugs so far. Docs are ok, though a little hard to search in and you constantly have to be aware, that the docs might only be relevant for their prior php-implementation. I followed this guide:

https://doc.owncloud.com/ocis/next/depl-examples/ubuntu-compose/ubuntu-compose-prod.html