Seafile not accessible from other devices on network

This one is still missing from the instructions. I’ve finally coaxed a new install of Seafile Pro v11 into action (taken me most of the day) but whilst seahub was starting, it wasn’t accessible from any other device on the network. curl -L http://127.0.0.1:8000 locally was returning a web page so I knew it was working.

Finally, a dim memory from when I first installed it years ago. I’m very anal and keep copious notes when installing servers and I had this in my notes:

This is still a problem. Why can’t gunicorn.conf be supplied with the binding as above by default?