[brtv]

I quite like NextCloud. It's a general purpose file hosting software, so you can dump anything in there. On Desktop I use VS code to write markdown, and on mobile I can edit and preview md files on the fly with the Nextcloud app. And then there's also the dedicated Nextcloud Notes app.

I'm using a Hetzner StorageShare, but you can also host it yourself, it's open source.

[warrenm]

I used to use QOwnNotes (iirc) with NC on my desktop - and CloudNote (again, iirc) on my phone

But they would constantly complain about not being able to sync because a file was open :|

Now I just use NC to do the sync behind the scenes with Obsidian (or emacs, or any other editor of choice)