"How do I relink playlists with my music on a new computer?: I just setup a new computer and I'm trying to relink my playlists with my music. I imported the exported playlists form the old computer and imported all my music to the Music app on my new computer but the playlists don't work. What's the process for doing this?"
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Syncing these Using an Apple Music Subscription:
Do you have an Apple Music subscription? If so, the playlist would be synced across your devices, as long as long as you permit your library to be uploaded to iCloud. As for getting the locally stored, you'd have to download them. Elsewise, it comes down to exporting and then import these as playlists. Learn More Here: Use Sync Library with your Apple Music Subscription - Apple Support