CMYK vs Pantone colors
Our digital presses print 4 colors only -- C, M, Y and K. If you upload a file that uses Pantone (PMS) colors, it won't print the color you're expecting. To make sure your items are the right colors, please convert any spot colors to CMYK.
It's easy to do! Just open the spot color swatch, change color mode to CMYK and color type to Process from Spot. You might want to change the color swatch name, to remind yourself you've changed the color type if you use that swatch again.
This was an example using Illustrator, but we've got a blog post that shows how to do this process in Photoshop and InDesign, too.