+1

I have multiple syncthings between phone and home nas:

- Photos (immich on server/mobile). I use master on phone, so immich don't delete on phone, and then rotate my folders out of syncthing directory and then clean my on device camera photo every few months

- Notes: (Obsidian on server/mobile). flawless

- SyncFolder: random folder to move between the two.

I'm using it too. Unfortunately their Android support is a little rough these days. Their official client stopped being developed and while there are options it isn't straightforward