Expression type '()' is ambiguous without more context

Question

I'm trying to do an upload with Alamofire using this code (where photo.image is a UIImage)

let imageData = UIImageJPEGRepresentation(photo.image, 1.0)

Alamofire.upload(
    multipartFormData: { multipartFormData in
        multipartFormData.append(data: imageData!, withName: "unicorn")
    },
    to: "https://httpbin.org/post",
    encodingCompletion: { encodingResult in
        switch encodingResult {
        case .success(let upload, _, _):
            upload.responseJSON { response in
                debugPrint(response)
            }
        case .failure(let encodingError):
            print(encodingError)
        }
    }
)

However, this tells me "Expression type '()' is ambiguous without more context.

I am not sure what I'm doing wrong here and would love some advice.

Answer 1

I had the wrong arguments for multipartFormData. Here's what worked:

multipartFormData: { multipartFormData in
                    multipartFormData.append(imageData!, withName: "photo", fileName: "image.jpg", mimeType: "image/jpg")
                },