Recently bought a Lightning to SD Card reader to import images from my SD Card in the field. However, it appears the process will import ALL images I've checked then upload them again. I cannot find an option or feature that allows me to ignore/skip duplicates. I notice it detects the images in Lr by placing a Lr icon in the corner. My questions is, where is the option to skip duplicates so i don't have to re-import and re-upload? It obviously detects previously imported files.