Synology Docker Default Paths

[Efficient_Good_5784]

https://github.com/zang74/jellyfin_config_backup

At the very bottom of this page, there is a note about
"If you've set up Jellyfin without static data directories, your config and cache folders will exist in random-hash-named directories under volume1/@docker/containers"

You already linked the config folder to a specific volume mount (from what I see in that screenshot).
You don't have to worry about that warning.

btw, you don't need to transfer the old cache to the new version. It will be recreated regardless and isn't needed to transfer your old settings.