I was running Dolphin on my Fedora Linux install to view some images, and I was confused as to why in “Icon” view I wasn’t seeing the actual thumbnail images as I would expect to see using Windows Explorer or similar.
I actually googled around a bit to figure out if I needed a JPG codec or something, but it turns out all I needed to do was click “Preview” instead of “Icons” !
Sometimes you overlook the obvious 🙂