Unable to mount Galaxy S4 on MAC please help

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http://forums.androidcentral.com – Hello, Yesterday I was able to connect my Samsung Galaxy S4 using Android File Transfer to my Mac OSX 10.8.3. Now today I can't get it to work. Any tips? I also tried to install Samsung Kies and neither can see my phone. When I connect to the USB on the phone it says "Connected as a Camera". I don't remember that before. How can I have it connect as a mass storage device or fix this issue? Thanks, Chris (HowTos)