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You can upload your custom artwork realized by using Packly die-cut template when creating the box in the Digital Services section. Once uploaded, you will view the virtual 3D model of the box with your custom artwork.
By purchasing a printed product, you can upload the printing file in My Packly > Orders. You will then get the virtual 3D preview and, as you will be satisfied with the final result, you can confirm the uploaded file to get it printed.