Newbie here getting No valid image file found

Running Deepstack on Raspberry Pi following all installation instructions strictly.
Trying to test by HTTP POST .jpg image file by “Postman” to the endpoint

Getting response
“success”: false,
“error”: “No valid image file found”,
“duration”: 0

Can anyone help please.

I was successful after I abandoned Postman and used the Python script form the documentation. Looks like it is the binary representation of the image that gets POSTed not the image itself.