jellyfin metadata location access

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This depends on your install type. With Synology, you may be able to run a docker package, which means you can map certain things where you want them. Metadata for the LSIO docker image, for example, is stored in /config/data/metadata. You can change that so images and such are stored next to media, but you'll likely lose performance swapping from SSD to HDD if that's how things are set up.

You actually should be able to import metadata from files and/or NFOs without causing any changes, since Jellyfin won't retag your files automatically. Simply follow the guidelines and you should be golden: https://jellyfin.org/docs/general/server/media/music/.