A message when a film arrives, a request comes in, an audiobook is ready, or a show you set a reminder for starts.
In Broadcast: Server, People, Notifications.
In Classic or Neu: Settings, Connections, Notifications.
Install the free ntfy app (App Store or Google Play); no account needed. Tap +, and subscribe to a topic: a name only you know, like usherr-k7q2x. Anyone who knows the name can read it, so make it hard to guess.
Where Usherr sends its notices.
Pick ntfy, keep https://ntfy.sh as the server (or your own), and type the same topic. Tick what you want to hear about: films and episodes downloaded, requests, audiobooks made, Live TV reminders, linked screenings, and a service going down or coming back. Then Test it.
Your phone buzzes when something you ticked happens. Each kind can be switched off any time.