I have been having this issue since I got my Macbook Pro a few years ago. I have enabled USB debugging on my Galaxy S4 Zoom and I have installed Android File Transfer on my laptop. When I try to start the Android File Transfer it says there are no Android devices connected. I have gone to my laptop's System Information to see if my phone had even popped up on the list, and it didn't. It charges when it connects, but it is still not being recognized. I have no idea what to do. I have been researching this for years and have gotten nowhere. I resorted to just emailing my photos and videos to myself a few at a time and downloading them on my laptop, then deleting them from my phone. I am out of storage and am immensely frustrated that nothing I do is working. PLEASE SOMEBODY HELP ME WITH THIS!!