I have iOS, and use MacBook/Linux.
EDIT: Wow! It’s impressive how many different ways there are to achieve this. I tried obsidian git, but couldn’t get it to work as expected. Remotely Save is working perfect! Obsidian flew under my radar all these days because I thought sync was the only way. I’m looking into plugins and there’s literally a thousand plugins. It’s kinda overwhelming tbh. I’ll make another post for plug-in recommendations and workflow setup advice. Thank you all!
I currently use Syncthing and it works with the exception of syncing to my iPad (and I imagine iPhone but I have an Android)… need to figure out something else for that. I did see someone somewhere mention CouchDB combined with https://github.com/vrtmrz/obsidian-livesync so I might try that and see if it works.