Cannot find other than "Camera Roll" in my PC when my iPad2 is connected to Window 8.1 via USB to my Lenovo PC

When my iPad2 is connected to Window 8.1 via USB to my Lenovo PC, I can not find Albums other than the Camera Roll. Is there a method by which I can make other albums visible to my PC? I am trying to copy them manually into a portable harddisk so all my photos and Videos in my iPad and iPhone will be backed up in one location for convenient access of all my photos & Videos.