CMYK or RGB setting. Files that have a mixture of RGB and CMYK color spaces (for example, text colors in RGB and images in CMYK) may not convert correctly. Recommend that color usage is consistent within the document.
Embed vector graphics, text, and all fonts.
Make sure that pages or spreads are the correct size (already cropped). Cropping can be managed on upload if a file has cut marks.
Embedded photos are a minimum of 300 ppi.
Each page or spread in the PDF file adheres to a logical naming convention including a page/number spread value. Interior page/spread numbering includes two leading zeros. For example, page three is named “catalog_name_003.pdf."