Yes, please turn off the bleed layer in the Photoshop spec file you downloaded before you convert your work to a .jpg or .png and upload it to Zno. Otherwise, your book will be printed with the bleed layer visible as if it is part of the image. Like this:
Versus how the image will look without the bleed layer turned on:
For more information on how to download the spec file, click here.
For any additional questions or concerns, feel free to reach us at (888) 966-9539 or support@zno.com.