Photo and video vault is good application for hide image , video and any file in smart phone. Your files will be secretly stored on storage, you only view when enter correct pin code. hidden photo app auto move origin file to other folder to security your photos. How does use "calculator photo vault" the application ? + Open app -> choose file that you want to hide. The calculator photo vault dectect and auto move to vault into other folder. These other application can not access to this folder