Apparently Framework did try to get AMD to use LPCAMM, but it just didn’t work from a signal integrity standpoint at the kind of speeds they need to run the memory at.

What filesystem are you using on the external drive? If it is NTFS or FAT, they won’t store permissions on the filesystem, which would explain why the owner/group changes are not persistent. To fix that, you can set the uid/gid on mount in your fstab.

/dev/mapper/YOUR_DRIVE /path/to/mnt <fstype> rw,uid=<jellyfin_uid>,gid=<jellyfin_gid>,dmask=0002,fmask=0113

Are you using the default bridge? I have a similar setup (with Traefik instead of NPM), and for each compose file am using separate networks for the internet, proxy, and backend services.

services:
  some_service:
    ...
    networks:
      - frontend_network
      - proxy_network
      - backend_network
  backend_service:
    ...
    networks:
      - backend_network
networks:
  frontend_network:
    driver: "bridge"
  proxy_network:
    driver: "bridge"
    internal: true
  backend_network:
    driver: "bridge"
    internal: true