Downloading a Youtube Report file with Google's OAuth 2.0 Playground

I'm new to the OAuth 2.0 authorization framework and I wanted to retrieve a Youtube report using Google's OAuth 2.0 Playground.

By looking at the doc I understand that I need to send an HTTP GET request to the URL provided in a report resource. No problem with that. But then I get here. How would I go about downloading the actual file?

Thank you