If you’re using Obsidian for free then maybe try the built-in link which you’ll find in the built-in options I think. It’s a cost option but cheap.

I’m not having problem with Syncthing, bar dealing with the stupid attempts to deal with deleted files that Android leaves laying around. I have .stignore files with .trashed-* and .trash/ entries on the Linux machine. Still having problems with _ed directories though and Syncthing conflict files when the sync isn’t fast enough when I switch between the two.

Sometimes it takes Syncthing a while to work out the best route between the two nodes. Sometimes days. It used to send my packets to the internet before letting them back into the local network. Eventually it found a more direct route between them. I’m not sure but I think it has something to do with local IPv6; I’m talking out of my ass though.

I’m not affiliated to Syncthing or Obsidian besides being a happy user.