thanks for this. I've got it working with Cloudflare tunnel.
The problem with umbrel was that the proxy wasnt forwarding the https request so BTCPay server didn't allow login for regular http.
If you know how to work with cloudflare tunnel dashboard, you can use my wrapper of cloudflared for startos: https://github.com/remcoros/cloudflared-startos
only needs the tunnel api key, all configuration of tunnels is done inside the CF dashboard.
Here are some internal hostnames+port of some startos services to use:

thanks for this. I've got it working with Cloudflare tunnel.
The problem with umbrel was that the proxy wasnt forwarding the https request so BTCPay server didn't allow login for regular http.
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