How did you get iPhone Syncthing + Obsidian working? I was under the impression that it was basically impossible to share Möbius Sync's directory with Obsidian.
Got it working myself. I set up a share inside of Mobius Sync that reaches into the Obsidian folder. (note the entire thing, just one vault). I think there was a popup saying it was unsupported but I haven't had any problems yet.