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Download and open Xplore File Manager. (This can be done with any file manager, but Xplore is easy to use.)

Navigate to the folder to which you want to move the pictures.

Swipe left, and you will see a list of folders on your right. Select the images you want to move by tapping the ticks on their sides.

Long-press on one of the files, and select Move from the menu that pops up. Then press okay.