I am not sure I will be able to explain the point verbally – it is typography related terms that I don’t know in English )
What I wanted to say is that the cover is to be cut in a specific way to look like a real ZenFone. This cut pattern was placed to a separate layer called Cutline in the file, and those designers who will prepare file for print should know what to do. The only thing that differs from usual z-card is that cut shape – ZenFone edges and curves are a bit different. I added pictures to explain my point. The first one is wrong way. The second is correct waу - look at the curves.
And to be confident that printing people got all things right in terms of colors and all we want them to make a preview pdf of what they get when they are ready to print. It is common practice in typography when it’s difficult to pass a sample print