Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
i have found a way to enable usb mass storage here How to enable USB Mass Storage on Samsung Galaxy S3 i9300 this might possibly help you out. you need to be rooted tho.
UPDATE: This guide will work only with Samsung Galaxy S3 devices that are rooted, as some users have pointed out. I thought that most Android users are used with applications such as the USB Mass Storage needing BusyBox and / or SuperSU in order to work with Android smartphones.