Moving from Plex to Jellyfin

[TheDreadPirate]

AFAIK, you can't make playlists out of URLs. But you can make M3U playlists with just a list of file paths. They can be absolute paths or relative paths. That is relative from where the M3U file is located (must be located in a library folder). When using docker, the absolute file paths must be absolute from the container's reference frame.