PDF as background
Can I use pages made in Illustrator, Photoshop, or InDesign?
Yes, you can.
Save the pages you've designed in Illustrator, Photoshop, or InDesign as PDF files. These PDF files can be uploaded into the editor and placed on a page.
The pages of the PDF file will be used on a portrait oriented A4 page, plus + 4 mm for the cutting edge, on all sides. To achieve the best results, this means that the pages in the graphics design program need to be formatted on a page size of 218x305 mm.
Take into account that the 4 mm edge might be cut off (the exact size of the cutline depends on the number of pages).