If your content has additional data that you'd like to offer as downloads, try using a File field.

1000

Adding a file field

976

Editing a file field

{
  "name": "file_field",
  "label": "File Field",
  "class": "file",
  "value": {
    "id": 124,
    "alt": "",
    "title": "Pizza_with_tomatoes",
    "caption": "",
    "description": "",
    "mime_type": "image/jpeg",
    "url": "//docs.rooftop.io/sites/2/2016/08/19103231/Pizza_with_tomatoes-1.jpg"
  }
}

See more information on this field.