An error occurred while saving the commentMarlon commented
Having the same issue. Trying to upload my book to iBook store and it's refusing my book because of these large PNG files. I do need a cover but apple specifies:
"The following images are larger than 4,000,000 pixels and must be resized: Full EPUB. To calculate the image pixels, multiply the image height by its width. For more information on image specifications, see the FAQ module on iTunes Connect."
Cover Setting "Choose Image" not Rasterize
What should I do??