Did the actual request send the file that you wanted, from the Collection runner?
When I use the Collection Runner, I see this as the preview of the file:
This is what the request body looks like for that request:
What does the request look like for you, in this view? Ensure to select Save responses before running the Collection.
I’m not sure why the Console Log output looks like that, I get the same thing, that might be a separate issue with the way that’s parsed, compared to what’s sent in the runner.