Sharp AQUOS Crystal - Manual (Page 326)

Connectivity 317
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If an option other than above is selected, touch Connected as a media device or
Connected as a camera and then USB mass storage (UMS).
3. After closing the notifications window, touch Turn on USB storage, and then touch OK.
4. Do one of the following:
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Copy files from the computer to the root folder on the phone’s storage card.
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Copy files from the phone’s storage card to a folder on your computer or computer desktop.