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... My first thought would be to flatten the image, which combines all 4 layers of a CMYK file for an easily transmittable file, like a JPEG. But that's a PhotoShop thing, and the error is not your mistake, but one made by whoever created to image file. Or maybe it's Black Magic, I dunno. Darn... Non Sequitur is my favorite.
You could check the app you use to transfer files to DU; that might have a hitch in its git-along.
I still have yet to figure out how to place images on DU, but it's on my to-do list. I'm 2 years and change shy of 80, so being technologically challenged kinda comes with the territory. That's my excuse, and I'm stickin' with it. 
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