Normally Zazzle doesn't let us reupload these RealView images, it will come up with an ambiguous error.
However, I have a legitiate use case, which is, using the images as the cover photo on my store categories.
I found a way past the blocking of the upload.
In your PC, right click the image file and click Properties. Then, go to the Details tab. Then, delete all text in the Comment section. Click Apply and OK.
The file will now successfully upload.
