HELP please with micro sd samsung galaxy s3

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http://androidforums.com – Hi. How do I program my phone to automatically save images from the net or music onto my new. 16GB micro sd card.? I've formatted the sd card properly but things keep saving onto samsung galaxy s3. There's an icon labeled "my files" and not sure which one is the micro sd. There is the ex sd card & an sd card. Thanks advance. (General)