But where does it say specifically that classic snaps don’t get automatic updates? My understanding was that all snaps, regardless of confinement got automatic updates
Classic snaps do auto-refresh. Devmode snaps do not. There is a situation where going from strict to classic (iirc) that the snap won’t auto-refresh to classic (@popey may have more details).
+1. Classic snaps refresh. Snaps which migrate from strict to classic do not autorefresh along the way. The user must remove and install the snap (with --classic) to opt into having an unconfined app which was previously confined.
Devmode snaps do not auto refresh. They can be force-refreshed.
Just installed this snap on two different system. No notifications showed on either of them when it was run on the command line. No errors but also no notifications. Looks like something changed in the last two years and broke this demo notification snap.