I’ve moved this into an own thread… going off-topic will occasionally derail those suggestion threads.
You can configure your library to prefer embedded metadata. In that case Plex will look for embedded tags in your files. This works for mp4/m4v/mov files – however not for mkv or other containers.
This is specifically not about metadata files – but embedded metadata.
Using metadata files (e.g. .nfo files) is covered in yet another feature suggestion.
