Try It: Support for sending binary file in post body

I'm testing "Try It" capabilities for sending a file as post body. My OAS document has the following:

post:
  ...
  requestBody:
    required: true
    content:
      application/octet-stream:
        schema:
          type: string
          format: binary

The API Reference page provides a file selector for the request body, which works great, except that the body ends up formatted as a Base64 encoded string, which is not desired:

data:image/jpeg;name=Jimmy%20Zimmerman%20-%20profile.jpg;base64,/9j/4AAQSkZJRgABAQAASA...

Instead, the endpoint expects the data to be sent as raw binary data.

Am I missing something in the OAS document to define that the data should be binary data, not base64 encoded?