Does anybody else think it would be super cool to be able to use custom thumbnails for extras? I’ve tried mp4 files with cover art embedded and using a separate image file sharing the same name as the extras file but it didn’t work. Some of my extras have plain black thumbnails or a blurred transitioning image.
There’s an existing feature suggestion discussing an option to edit the metadata of local extras, including an option to modify the poster/artwork. I suggest you comment/vote in that thread in order to avoid distracting or cannibalizing votes.
I’ll close this thread as a duplicate.
2022 clean-up: duplicate