Why does Sonarr keep telling me that it cannot import a file downloaded by nzbGet? (AKA Linking between containers) This problem seems to continually be brought back up, and the reasons all go back to host / container volume mapping.  (note that I'm using nzbget / sonarr as an example, but the concept is the same for any apps that communicate via their APIs and not by "blackhole" method) First and foremost, within Sonarr's settings, tell it to communicate to nzbGet via the IP address of t