The customer's document, now converted into a PDF, can be downloaded when you are ready for production. Before the document has been downloaded the preview pane can not display a preview of the document, as shown in the example below. If a Paper Original is orders you will see the same preview pane when the order is selected.
When a document has been downloaded a preview is displayed, as shown in the example below. If the file is a zip file it will show a zip file image, as shown below.