Really weird and a royal pain in the neck. When I open files from the camera itself using a USB cable, I get preview thumbnails, albeit with a unexpected black top and bottom border, but when I open copies of the same files residing on my Windows 10 PC I don't get preview thumbnails. Doesn't matter if I copy the files with or without the folders. NEF RAW files of the Nikon D70 work just fine.
Anybody know what's going on and what to do to remedy this situation?
