Originally Posted by
fedxup I was just about to post the same thing. I was tyring to copy over my music folder last night and my Mac wouldn't find the device. I installed the Android File Transfer app per Googles instructions, but when I opened it, I got a message saying no Android device found.
Did you set your phone to Media sync by tapping the USB icon in your notifications tray? I believe it was the media sync one. Theres only two to choose from so try them both. It worked for me on Mountain Lion.
I launched Android File Transfer on my laptop, plugged the phone in to get the USB in my notications on my phone screen and then tapped the USB to select media sync and boom it worked.