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The other option is to support Home Assistant development, pay for Home Assistant Cloud and let them handle remote access for you 😁

Just clicking submit will automatically add the entity and resolve the issue. I’ve just done it myself.

Why not use Tailscale on each device?

No need to expose any ports, no need for a bastion, no need for any complicated method of retrieving their public IP address, can use ACLs to restrict their access to other devices on the tailnet (if they’re tech-savvy enough to go looking at the tailnet in the first place).

Essentially, as long as they have internet and Tailscale is running, you’ll be able to connect to their device without exposing anything over the internet.

That is what it means, If the movie in your library is not on one of your lists it will be removed from radarr and the file will be deleted from disk.