Sirv API expects Content-Type: image/json, Postman sends application/octet-stream

I am trying to upload a file to https://api.sirv.com/v2/files/upload?filename=/the-map/brenner-prof-pic-2.jpg using Postman.

documentation on the API here: https://api.sirv.com/v2/docs?path=/v2/files/upload#POST

The file gets uploaded, but when I go to view the image at https://themap.sirv.com/the-map/brenner-prof-pic-2.jpg it tells me it’s an unsupported media type: application/octet-stream

How do I send the jpg correctly?