File Name: layers and transparencies should be flattened in the file.zip
In general, what it does is consolidate everything into the imaging level, creating a simple pdf.
So, what exactly are layers and why do they matter? Lulu—and all the other publishers out there—like to tell would-be authors how easy it is to create a book. And, if we want to get technical, publishing today is easy. Easier than it ever has been in the past at least. Uploading a file and ordering a bound book from that file is easy. Anyone who has endeavored to print a book knows that laying out your file is an art form.
If you print your PDF as is, you will only print the layer that is visible onscreen as opposed to all visual elements from various layers. To avoid this issue, you want to flatten your PDF file for print. Flattening a PDF for print removes transparency information and converts images to a format that the printer can read. Pro tip: Save a working version of your file as well as a PDF version that you can flatten. A PDF short for Portable Document Format is the universally accepted and preferred file format for many print providers, Printivity included. A PDF can be set up to provide your printing company all of the information they need, such as color profile and embedded fonts, to ensure a smooth printing process. PDFs capture formatting information from a number of desktop publishing applications, allowing a consistent and unchanging view of what your file should look like from one device to the next.
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PDFs are flattened for several purposes and though it may seem like it is an obsolete and forgotten feature in applications, it can still serve a lot of benefits for printers, users, and authors. PDF documents by default are transparent however, artworks made by Adobe Illustrator and Photoshop may not be so. Flattening transparency in PDF can either provide you with a white background or allow you to make transparency in your graphics possible. These two depend on the preferences you make with the application.
Here's the Windows or Mac version. After thats done you can open Acrobat again and under your stamps there should be an "Engagement Tickmarks" category with all of them in there. Go to Comment, in the top right, and click on the drop down next to the stamp tool. Use this tool to automatically flatten PDF stamps and make them part of the document.