Media data source designed to show various media added to products. For example, if you add audio media files to products and create a new Data Listing block with Media source you can show a list of these media files on the product page. Do not forget to add the block to the Product page layout!
For example, see how to add links with downloadable pdf media to the product
1. Upload pdf file or files to the products media
2. The next step is to create a new Data Listing block.
Choose Listing Data Source: Media and select PDF as media type
3. After block creation add Block to Layout
You can add your data listing block to some specific product page layout inside Product edit page or add to all products via common Default Product Page layout. Note: block will be displayed only if product have any media with selected data source, in our example PDF
4. After adding to Layouts your Data Listing block with links to pdf files appear on the product page