Cross-platform music library app?

I’m a MacOS user who recently switched to Graphene. Are there any cross-platform apps that I can use to sync music libary across devices? I don’t want a streaming service. Like iTunes used to do in the olden days, I want to be able to put music in a library on my laptop and then just plug in my phone have it sync. Initially, I thought VLC would work, but I don’t see a syncing option.