Non-nullable property 'name' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'message' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Possible null reference argument for parameter 'buffer' in 'MemoryStream.MemoryStream(byte[] buffer)'.

Possible null reference argument for parameter 'fileName' in 'void MultipartFormDataContent.Add(HttpContent content, string name, string fileName)'.

Possible null reference return.