No access on IOS devices

Hi

New to nextcloud. I am setup using a paid for domain, and nginx. Everything is working perfectly, pc, mobile etc apart from IOs devices.

The main index login page loads with the logo and cloud background, and it loads the app (Login Notes) but it does not load the actual login form for username and password, so I have no way to log in?

I have been reading and placed proxy_hide_header Upgrade; in my nginx advanced area but doesn’t seem to make any difference

https://cloud.saltire-roofing.org if you want to try

any help much appreciated, also have AnyDesk if someone can help remotely

Running Mysql, php 8.1 on Proxmox

Can you give more details about the network setup? Are client and server on the same network? If yes does it change for external access from outside your network?