Cannot add item to custom collection

[fritzmg]

Here is the Docker Compose YAML for the Docker container, in case it matters:

Code:

services:
  jellyfin:
    image: jellyfin/jellyfin
    container_name: jellyfin
    restart: unless-stopped
    user: 1026:100
    group_add:
      - '101'
      - '937'
    network_mode: 'host'
    volumes:
      - /volume1/docker/jellyfin/config:/config
      - /volume1/docker/jellyfin/cache:/cache
      - /volume1/movies:/media/movies
      - /volume1/shows:/media/shows
    devices:
      - /dev/dri/renderD128:/dev/dri/renderD128
    environment:
      - JELLYFIN_PublishedServerUrl=https://jellyfin.example.com

So should be pretty straight forward - expect the user and group ID and devices for hardware transcoding using Intel QuickSync.