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I have added some interviews to an album in my music folder. I named it correctly inline as in the tutorial page its written (Filename-interview.mov). But the interviews are not visible in the album.
Then i moved the interview to the root folder of the artists and now its visible on the artist page. But it is visible two times. It is only one File there:
you shouldn’t do that.
consider the global music video path to be a link to a separate location where you keep your music videos. In your case, Plex finds the music video when scanning the music library for local extras as well when scanning the global music video folder.
The Help page is in error regarding this, when it says to put the files in the same folder as the album. As you found, they need to be in the Artist folder.