Login into your website and choose Tienda from the Components dropdown. From the Dashboard choose Catalog
Choose the product that you would like to add the multiple images.
Click Manage Files
Choose where you would like your file/digital download to come from. Either as a new file or a new file from your server.
Enter a name that you want customers to see for the file. Select Yes or No if you want a client/customer to be able to purchase the file. Then select Yes or No if you would like the file enabled on the front end of your website. Decide the Max Number of Downloads you would like available (Use -1 for unlimited downloading). Click Save Changes. Close the lightbox (using the X in the top right corner).