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This is definitely really really late but I just discovered this for myself. I am going to answer in case you haven't found the answer yet because it's really frustrating on my hand and I am so happy that I managed to discover how. Also answering just in case I forgot how:
Go to your installed wallpapers. Click the one you wanted to have a thumbnail or preview photo. Click "open in editor". Once there, click Edit and then choose "Change Project Settings". Then you will see the Preview Image. There's Take Snapshot or Import File. Your choice which one you wanted to go for and that's it. You now have a thumbnail for your Wallpaper Engine item.
I hope this helps.