Playlists aren't syncing from iTunes to iPhone
I've made numerous attempts to sync my playlists on iTunes with my iPhone, and none of the alternatives for doing so is working (e.g. I've tried selecting the playlists I want to sync when I'm working on the device page in iTunes, and clicking on sync; and, I've tried to manually drag them to my device on the iTunes start page).
If this helps, I've noticed when I try to drag the playlists to my device, the box flashes blue three times. I'm sure this is trying to tell me something.
iPhone SE, iOS 12