Transferring music files from Mac to samsung gs5

I used to be able to plug my phone in, and transfer music files easily, now, I can't even get android file transfer to open! Help!
 
You can download Samsung galaxy gs5 driver for mac and try to connect via USB here is the link for download driver
teamandroid.com/2014/03/25/samsung-galaxy-s5-usb-drivers-download/
 
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