How to install Immich on a Synology NAS using Container Manager / Docker Compose

Get yourself a self hosted version of Google Photos on a Synology NAS. But not Synology Photos. But you could use both. Visit immich.app if you want to get more info about their work.
If you're interested in accessing Immich out of your home network the safest way to set up a VPN on your Synology NAS. I recommend Tailscale. If you really want a custom URL try looking up videos about using reverse proxy (settings.. login portal.. advanced.. reverse proxy) and SSL certificates / Let's Encrypt.
If you want to use your existing library of photos you can check out Immich's website and go to Docs / Features / Libraries and scroll down to Mount Docker Volumes (but also probably ready the stuff before that but maybe not but probably). It's not the easiest task in the world. But doable. I believe in you.