When I plug my Samsung Grand Prime into my Windows 10 machine via USB it pops right up and I can transfer files to and from the internal memory and micro SD Card. This is how I load my music onto it. Now that I have a iMac I wanted to use it for all my music and load my phone from it. Problem is when I plug it in it charges but nothing mounts on the desktop or in Finder. How do I get Mavericks to see the phone so I can copy music to it?