Thanks for that link. I take lots of photos and only want to save the best. I bought a lightning->SD card adapter but the Photos app would only show pictures

Thanks for that link. I take lots of photos and only want to save the best. I bought a lightning->SD card adapter but the Photos app would only show pictures in a grid. I wanted to see them as large as possible so I could pick the one with the fewest number of eyes closed or whatever. "One of the most welcomed new features we’ve come across is the ability to preview your photos full-screen. Before iOS 12, you could only see small thumbnails of photos when importing, which made it all but impossible to select a particular image in a sequence if there wasn’t much visual difference. Now, you can pinch out on a thumbnail and see a full-size preview." That might not work as smoothly as I hope. I'd like to go through 100 photos, all full-size, checking the ones I want. The limiting factor might be that it takes about a second to import each photo. Although you'd think if you were viewing them sequentially it could be loading the next one while you were looking at this one.