Unable to connect remotely

[King Mustard]

In the Port forwarding section.

Name - Jellyfin  (arbitrary)
Ext port - 8096
Protocol - TCP
Int IP - 192.168.1.10 (replace with actual LAN IP of the Jellyfin server)
Int port - 8096
Enable - checked

If you are talking about your PUBLIC IP address being dynamic, that would require you acquire a DDNS domain name.  Which is free from a lot of providers.  Most people use DuckDNS.

You'd install their client on the server and when it detects that your public IP changes it will push an update.

Thank you for your help so far.

I have entered those details into the Port Forwarding section and rebooted the router.

I have disabled Wi-Fi on my phone (to simulate being away) and when I open the Jellyfin app, it asks for an IP address.

I know I cannot enter the local IP address of the machine Jellyfin sits on (192.168.7.1).

What do I enter there?

I tried entering what shows as the public IPv4 address that I found by running on www.whatismyip.com on the Jellyfin machine into the app (plus adding :8096) but no connection.