How to upload "Thumbnail" images to TheMovieDb?

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Multiple metadata providers means multiple types of metadata. Those images may or may not come from TMDB. I don't have experience as a TMDB editor/contributor so I'm not sure I can answer this question effectively other than to say that a good portion of my thumbnails come from the image extractor metadata provider, both for show thumbs and continue watching thumbs. If we're talking about movies, depending on which metadata providers you have enabled and what order they're in, a different provider might provide those thumbnails rather than TMDB.