So I was able to install everything correctly, but I don’t know what I’m supposed to do in order for people that don’t have my same IP to see my files. I’d like to share my Jellyfin server with some friends so they can see movies there. I’ve already open the ports, but they can’t still access them, I’m using elementaryOS Hera which is built on Ubuntu 18.04.4 LTS.
Are you behind CG-NAT ? An easy way to check this is if the IP address reported by your router is different from your public IP.
I don’t know the difference between a double NAT or a CG-NAT, but I’m under a double NAT (I mentioned it in another comment, but it may be buried among all the replies) so yes, that’s why this doesn’t work, I’ve contacted my ISP an I’m trying to get and IPv6, but from what I heard they only give it to companies. :/
Yeah maybe I didn’t see that comment (in fact don’t see it still). Unfortunately, you can’t expose a service to others behind a NAT. You can either get a cheap VPS and do some reverse tunneling (the speed with which others load Jellyfin will be limited by your personal upload speed), or get a slightly expensive VPS and host Jellyfin on it.