To ensure we place the spot holo/glitter effect where you'd like, it's requested that sticker files are uploaded as a PSD with two layers. One layer containing the entire image, and another layer where the holographic parts are removed.
While this isn't required, it helps ensure that your stickers come out exactly how you'd like in a timely manner. If this can't be done, a PNG will suffice, but may prolong the design phase of your sticker production.
