with the mention of Mac, that's out of my territory as I have a PC. But yes, like the PC (which I use WinSCP), there is a program you need that is similar to an FTP server. I think iFuntastic might be one but not sure on the Mac side, but once installed it allows you to access your phone and the various folders in it.
Before you move on, do a search for that access as you will need it to continue, I think. Again, knowing you're on a Mac means that what I said may be wrong so if someone else chimes in with better info, listen to them