This warning is given by our Prepress team if you haven't uploaded enough files that are required to print what you have ordered.
This includes supplying fewer designs than the number of sets you have ordered.
For example, if you ordered 2 sets of business cards but uploaded artwork for just 1 set, you will receive an Online PDF proof with this message. If you approve the proof the same artwork will be printed on both sets.
If you would like to supply different artwork for the other set/s, please click the red Decline Proof button and re-submit new artwork files for all sets.
Handy Tip: Appropriately naming your files will help us process your order more quickly.
See: File Naming.