If you have marked a playlist as Available Offline, and songs won't download (no song has the loading symbol and they have a gray arrow next to them) then try deleting apps and stuff you don't need and maybe that helps.
If you have marked a playlist as Available Offline, and songs won't download (no song has the loading symbol and they have a gray arrow next to them) then try deleting apps and stuff you don't need and maybe that helps.