Ignore images previously imported

Ever since buying my Olympus EM1, Olympus viewer 3 software supplied with the camera, had met my storage and editing needs until going wrong a few months ago. All of my efforts and those of Olympus support failed to fix it and I finally gave up and purchased Photoshop Elements 2018 a few days ago. I never delete images that matter to me from my cards, and the day after purchase imported about 4000 images from 6 cards with no problems. The  following day, with another 3 images to save, I went to import, expecting to see a prompt to ignore those previously imported, but no. The 500 or so images on the card did not always appear in order of shooting in Advanced Options, leaving me having to deselect all then go through the frustrating, time-consuming and visually tiring experience of scrolling through the whole card to select 3 images. Surely there must be a better way but to date I can find none.  Any suggestions would be most welcome.