When away from a computer is it possible to view photos & videos on an iPad using the supplied micro USB cable connected to an iPad via a USB to lightning adapter?

simplest way to preview your images and videos  without computer is view them in DJI GO...

If you are referring to a Windows based, the best way I have found to move photo / video files from the PC to the iPad is to use a third party app.  I use one called PhotoSync that allows you to transfer file from the PC to the iPad / iPhone OR from the iPad / iPhone to the PC via your home wireless network.  For me, it's the easiest and fastest way.