Saving normal and 3D images
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It is possible to save a JPEG image to your SD Card, if it is displayed by itself on the upper screen. You display it there by either opening a direct link to it, or by selecting an image on the lower screen, holding it for a second and then lifting your stylus. The saved images can be viewed using Nintendo 3DS Camera, and compatible 3D images can also be saved.
Note that certain JPEG images can not be displayed or saved.