Music playlist sync slow to Apple Watch

I ran into an issue recently trying to put music on my Apple Watch before going for a run so I could leave the phone behind. I set it to sync a playlist through the Watch app on the iPhone. But it was slow!

It was just stuck on “pending sync.” The synchronization was not progressing. The iPhone paused the sync and was waiting. It was not apparent what the iPhone expected. But apparently, the iPhone was waiting for me to charge the Apple Watch. (The Apple Watch was still on my wrist.) The Apple Watch needs to be charging for any synchronization to occur.

As soon as I put the Apple Watch to charge, the playlist sync began. No more stuck on “pending sync.” It was still slow. Apple needs to figure out how to make it go faster. But at least progress was happening. Eventually, it completed, and I could leave the phone behind.