Hey, I’m doing this now, using DuckDNS. But I had to forward a port thru Router 1, as you call it. That’s your problem.

Maybe Tailscale would help you? (I’ve not used it though)

Or, instead of allowing port 80/443 traffic in, what I have is a random port used by my Wireguard VPN opened only. But I have to connect thru that when I’m not at home. I. E. only I can access my web server.

Does this help, OP?

https://selfh.st/apps/?tag=File+Management