I've verified the import works manually using my own CSV file.
When I originally made the template, using the App Card template as a guide, I wasn't sure where I needed to put the template so I added another sentence below the list of templates with a brief explanation on where a user should add them.
Discover Card's statements are available to download as a CSV at https://card.discover.com/cardmembersvcs/statements/app/activity#/current
I've verified the import works manually using my own CSV file.
When I originally made the template, using the App Card template as a guide, I wasn't sure where I needed to put the template so I added another sentence below the list of templates with a brief explanation on where a user should add them.