I have the same setup. One question, is there a Syncthing solution for iOS devices?
Edit to add:
There is Möbius Sync [0] but I didn't have much success with it. It did work but not quite the way I wanted so eventually I just deleted it.
On Reddit [1] people suggest all sorts of workarounds using other sync tools, like iCloud or NextCloud. Not ideal.
[0] https://www.mobiussync.com/ [1] https://www.reddit.com/r/Syncthing/comments/ese82l/ios_users...