I'm just using Google Drive with the files the app uses on Windows and mobile (using FolderSync for Android). I'll probably try out the git plugin soon so I can use it easily with Linux but was trying to use Obsidian without and additional plugins for a while as I'm just trying it out.
I did it just fine for the cost of the license of Working Copy syncing to a iCloud folder. But the Obsidian license still made me end up going over to LogSeq, which works better for my mental model.
i am hoping, like onenote, a note taking system that i can use on computer and mobile devices and sync to each other, easily. This is very natural need.