They have different usage scenarios.
LocalSend is for the occasional sending of files/folders from A to B or B to A (One direction only).
Syncthing’s primary usage is for keeping the exact same copies of files on A and B automatically.
Yeah, I had the same problem and the same thing fixed it. Fully log out, then log in. Seems like version 19 Changed authentication or something similar requiring a fresh sign-in.
That’s a lot of partners…
A really nice summary. Very useful. Thanks!