Samsung S4 - turn on mass storage

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http://androidforums.com – Hi all, my new galaxy s4 just arrived and am trying to sync music from my itunes using double twist and it ask to turn on the mass storage option. pulling down the notification bar, the only option i get is 'connected as a media device', selecting this produces 2 options: media device and camera. either is not recognised by double twist or two different sync software i tried as mass storage options. can anyone please help? i have managed to locate the developer option in settings and ticked the option for USB debugging...but still no sucess. thanks (General)