Back in 2020, those of us who had been using the OnlyOffice community document server were greeted with a notification stating that mobile editing was no longer supported and that we’d have to buy their commercial product.

Some folks quickly figured out a patch. Others, like myself, left with a bad taste in our mouths.

https://github.com/nextcloud/documentserver_community/issues/94

Something worth noting is that F-Droid is both an app to download other apps but they also maintains a repository of apps. You can use alternative store apps (like Droid-ify) with the F-Droid repository OR you could use the F-Droid app with a different repository (like IzzyOnDroid). You can mix and match to meet your needs.

I use the Droid-ify app with the F-Droid, IzzyOnDroid, microG, NewPipe, and Collabora repositories.

Once you start down this rabbit hole, give Obtanium a look.