I've personally had great success with KDE Connect on the LAN for all that (and also as a handy touchpad / keyboard input device for PC). It's one of those "Ju

I've personally had great success with KDE Connect on the LAN for all that (and also as a handy touchpad / keyboard input device for PC). It's one of those "Just Works" tools I always reach for. Also have found SyncThing to be really excellent for keeping folders auto-sync'd between devices. (One personal use-case example for that is keeping my "Pictures" folder in sync between my phone camera and a local folder on one or more of my PCs.)