Create a record.
Click on the down arrow (1) on the right of the Store's menu to display the options and select "Downloads". (2)

- Insert a title; the title will be displayed as the title of the file in the Thank You page. (1)
- Insert your URL of the file. (2)
- Save the record. (3)

The record has been created. 👌
You can repeat the process to add a new records for more digital files. You can attach multiple files in the record of the Product and deliver them all in the Thank You page.