How to fix "The request content is missing config json file"?

I am sending a POST request to https://publish.roblox.com/docs#!/Items/post_v1_assets_upload and the output is saying "The request content is missing config json file." How would I go about fixing this or embedding a config.json file in the model?

You have to upload a JSON file called "config.json" with it which stores the model's information (UploadAssetResponse), It's saying how to format it at the top where it says "Response Class (200)" on https://publish.roblox.com/docs#!/Items/post_v1_assets_upload