How do I know which container uses what folder in LMDS?

Structure:

~/LMDS
      /media (media files - map this folder to external storage)
            /tvshows (keep here all your existing TV Shows)
            /movies (keep here all your existing Movies)
            /music (keep here all your existing Misic)

      /downloads (containers download folder - map this folder to external storage)

      /volumes (persistent volumes for each container configuration)
              /container1 (i.e. Portainer)
              /container2 (i.e. Jackett)
              /container3 (i.e. Sonarr)
                    ...

      /services (containers deployment configuration files)
               /container1/service.yml (i.e. Portainer)
               /container2/service.yml (i.e. Jackett)
               /container3/service.yml (i.e. Sonarr)
                   ...

     /scripts (docker stop/start etc. scripts)

In order to determine which folder is associated with each container, you can edit the docker-compose.yml file. Here, you will find the initial declaration for each container you have deployed.

  sonarr:
    image: linuxserver/sonarr
    container_name: sonarr
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Europe/London
      - UMASK_SET=022 #optional
    volumes:
      - ./volumes/sonarr/data:/config
      - ./media/tvshows:/tv
      - ./downloads:/downloads
    ports:
      - 8989:8989
    restart: unless-stopped

Look at "volumes" section i.e.:

Sonarr container can see folder called "tv" which is mapped to ./media/tvshows that is pointing to ~/LMDS/media/tvshows Above mean, that if you add anything to ~/LMDS/media/tvshows Sonarr will see it under "tv" folder internally.