Can I copy full-resolution photos taken with Lumia Camera from my computer back to my phone?

Yes, you can. But in order to open the photos in Lumia Camera’s full-resolution view, you must do the following: After you have copied the photos back to your phone, open Lumia Camera, and tap  > settings > find photos and videos shot with Lumia Camera. When you go to the camera roll, you can open the photos in Lumia Camera’s viewer. Just tap the link captured by Lumia Camera under the photo.