FileUploadExample.cs

    		[Route("Upload/")]
		[HttpPost]		
    		public async Task<object> Upload(string fileName){			
			string path = Path.GetTempPath();
			var provider = new MultipartFormDataStreamProvider(path); 
			await Request.Content.ReadAsMultipartAsync(provider);
			var tmpFilePath = provider.FileData.Select(entry => entry.LocalFileName).First();
			var targetFilePath = Path.Combine(@"C:\tmp\", fileName);
			File.Copy(tmpFilePath,targetFilePath);
			return fileName + " has been saved on " + targetFilePath + " via " + tmpFilePath;
		}

Postman.md

• url: (your test url)/Upload/?fileName=hello2.jpg

• method: POST

• Body -> form-data

• Key could be blank but select file type. In value, select a file.

Web.config

<system.web>
    <httpRuntime maxRequestLength="30000000" />
</system.web>

<system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="30000000" />
      </requestFiltering>
    </security>
</system.webServer>