Message from Amazon:
Add 0.125" (3.2 mm) to your book's page width and 0.25" (6.4 mm) to the page height to ensure that the images in your manuscript extend beyond the edge of the page. Once you have added the size, extend any images or backgrounds that you want to reach all the way to the edge of the page 0.125” (3.2 mm) beyond the trim line. This prevents manufacturing issues when the file is trimmed to size.
If you have any images in your book that extend to the edges of the page, Atticus automatically adds the necessary bleed allowance to the book's width and height.
Additionally, if you've incorporated full-page images in your book that are set to bleed, or if you've utilized a theme with a background image, it's important to select the Bleed option in KDP when you're publishing. You can find this setting just after selecting your trim size inside KDP.
Selecting the Bleed option in KDP should resolve the error. However, if the issue persists even after selecting the bleed option or if you've already chosen it, it may indicate that Amazon has detected an image extending beyond the margins but with a white border around or below the image.
When preparing images for Amazon, it's crucial to ensure that full bleed images extend 0.125 inches beyond the outer edges of the pages with no white border around the edges of the image. This means that the image should cover the entire page, extending beyond the page edges.
