I'm not sure that what you are saying is the right approach.
Google Cardboard seems to have its own file system and they have removed the option to load files other than their demos (which are pretty good and interesting).
I have been chasing this for a bit.
Based on internet advice ...
I have created a 360 panorama still image with the Lightwave VR camera and ran it through Google Street View to get it into the right format and Street View then offered the option to load the image into Google Cardboard.
It was an image of a room and I could look around the room in Google Cardboard using an iphone.
Very useful stuff.
However, I have not been able to repeat the experience. I cannot get Google Cardboard to load the image again.