It constantly monitors the TV Shows/Movies folders on the HDD for any additions and pulls metadata (cover, IMDB details, rating, etc) for the media found. Plex Media Server is the last step in the chain.

When Sonarr/Radarr finish processing the files, a request is made to Bazarr which monitors these files to find and download suitable subtitles in the specified language from a list of pre-defined providers. On successful download qBittorrent pings Sonarr/Radarr which mark the media as available, rename the files and move them to their corresponding TV Shows/Movies folders on the HDD. Once the media is made available online, Prowlarr finds a suitable torrent file and notifies Sonarr/Radarr that a torrent was found and sends a request to qBittorrent to begin the download. Sonarr/Radarr continuously monitor the requested files and query Prowlarr, which is a Torrent Indexer service to search for the TV Show/Movie in the pre-configured Torrent providers. Ombi passes the user request to Sonarr (if the request is a TV Show) or to Radarr (if the request is a Movie) to identify the media and start the monitor process.

This is how the various docker containers with the relevant services work together in the background to process the request: There is no user interaction after that until the Movie or TV Show you requested is ready for viewing in Plex. Once the request is made in Ombi you are done! This is what makes this device the Ultimate Media Server. Ombi offers a user friendly front-end to find Movies & TV Shows you want to watch and request these to be downloaded from the internet.

Raspberry pi media server