FYI, read this.

in nginx:

server {
...
location / {
    ...
    proxy_pass https://redacted.......;
    proxy_pass_request_headers on;
    proxy_pass_header   Set-Cookie;
    proxy_set_header HOST $host;
    proxy_set_header Referer $http_referer;
    proxy_set_header X-Forwarded-Proto $scheme;

    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-Host $server_name;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
...
  }
}

I think the was a trusted proxy setting in owncloud itself that needed to be set too, or maybe I'm thinking of another service.

What env vars are you using for the docker and what's in the config.php?

If you’re hosting via docker, I highly recommend deploying a Traefik container as it is a phenomenal reverse proxy to pair with containerized hosting

Not familiar with owncloud.

But can't you set something like "http://127.0.0.1" as domain?

You need to forward the real IP from nginx.
I'll upload an example when I get off work

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Yeah see I'm not even sure what the env vars are. I'm running it with docker-compose and the only alterations I've made to anything are to add my IP address to the config file in the trusted domains array. That's definitely where it needs to go because if I take it out then it flops hard.

Ah, thank-you so much!