Backcover Import

Hi, really need some assistance.

I am trying to use the import feature for the BackCover.

I have a data feed that i am using and it contains the following data fields.

Product code ,Detailed image

When importing the backcover there are 3 fields that is required

Product code, Detailed image, pair type

What would i put in my data field for pair type and data?

I am having issues is when i try to upload the backcover. my product list (icon) does not display the images. Prior to upload it contained the images.

So i am not sure what to do.