There used to be a main thread but it seemed like it had been abandoned by Plex support, and is now locked:
There are still numerous instances where the automatically matched trailer is wrong. I haven’t been able to figure out any way to correct this myself. Is this just in the ‘too bad so sad’ feature pile now, or is there actually a way to get a correct/better match? (Without having to manually seek and download a local extras/trailer file)