Website >> eCommerce >> Orders (or the Sales app) and open the order.
Orders containing customized products show a Print.App tab with, for every
customized line: the customer’s design previews, download links for the
print-ready PDF, PNG, JPG and TIFF files, and a Modify Project link that
opens the project in your Print.App admin.
The customer’s own previews also appear on their order confirmation page and in
their portal. If you enable Customer Download Link in the Print.App settings,
customers can download the print-ready PDF of their design from their order page
as well.