I've been having success with Dropbox/Dropsync into the Obsidian directory on my android device, and I know some folks have been using Syncthing without a hitch

I've been having success with Dropbox/Dropsync into the Obsidian directory on my android device, and I know some folks have been using Syncthing without a hitch. The paid Obsidian Sync is just the only one they promise to "fully support" since they can't bugfix other apps, as far as I know.