Joe, thanks, I think iphone is 8GB, and can hold 2k songs. So my little playlist sof 2k songs fits well for now and last 10 years.
Next phone all over then get full 30 gb or whatever I have...

But for now: How do you sync one specific playlist via finder, do not see that? (everything greyed out)

Yeah finder way better .. in Music, does not show anything. The finder could be better too, but beats out Music app.