Your end user can download a file with the file response.
You can either add the URL of the file, or upload it by yourself.
The file response contains three fields:
url: The URL of the file. Note that when you upload a file, the
urlautomatically fills with the file's URL.
name: The name you want to show the user.
size: The size of the file. Note that the size must be greater than 10 bytes.