Adding a Product | Product Files
The Product Files tab can be reached by adding or editing a product and setting the Product Type field to Downloadable. In this tab, you can upload the file or files you want to send the customer when they purchase the product.
To learn more about setting up a downloadable product, see Creating Downloadable Products.
The top part of the tab shows you details about any files you've already uploaded, including the name and download limitations.
The second part is a field for uploading files to the product. You'll be asked to fill out the name, upload the file, and specify any limitations on the download.