Upload file for attachment

[joewak]

I'm trying this:

            byte[] documentData = System.IO.File.ReadAllBytes(file_path);
            Upload attachment = manager.UploadFile(documentData);

When I do so, I get an exception:

           WebException: The remote server returned an error: (422) Unprocessable Entity.
           RedmineException: Invalid or missing attribute parameters: Attachment extension  is not allowed

Poking around in this function in InternalRedmineApiWebClient.cs:

        public ApiResponseMessage Upload(string address, byte[] data, RequestOptions requestOptions = null)
        {
            var content = new ByteArrayApiRequestMessageContent(data);
            return HandleRequest(address, HttpVerbs.**UPLOAD**, requestOptions, content);
        }

The Redmine REST API documentation says a POST should be used to upload a file. Should it be POST instead of UPLOAD?