I have a large number of files tagged as a custom Genre and want to update them all to be the actual genre as provided by TMDB or whatever the default source is. What is the best way to update the genre tag in all these movies? I’ve tried both refreshing the metadata and fixing the match but neither changes the genre tag back to what it should be.
You need to clear the agent cache before refreshing the metadata. https://support.plex.tv/articles/202967376-clearing-plugin-channel-agent-http-caches/