odd message when I try to move song or album from laptop to iPhone
I am getting this message when I try to move a song or album from laptop to iPhone: "The iPhone “iPhone” cannot be synced because there is not enough free space to hold all of the selected items (additional 5 GB required). "
I have "sync only checked songs" checked in my settings and have tried dragging and dropping with a single song or a single album and get the same message though each is far, far smaller than 5GB. Are other files checked for download without me knowing? How do I find and uncheck them or whatever is needed?
MacBook Pro 13″, macOS 10.13