I'm not certain if this is truly a JMeter bug or an IIS/ASP bug. I'll give a brief description here, but I have loads of supporting info and files at https://stackoverflow.com/questions/45291222/jmeter-3-2-file-upload-hitting-asp-net-as-null-file
Using JMeter 3.2, Windows 10, IIS 10, ASP 4.5, Visual Studio 2015 (c#, MVC). Without running JMeter I can upload a file and the server receives it. When I'm running JMeter (just recording) and I attempt to upload the file I get an error page because the function the runs when a file is upload got called, but the upload is "null". So it doesn't see the file that it was supposed to get. I have a sample project with the sample site and a JMeter script that can easily be run between 2 windows machines. I'm hoping somebody has some insight into why that is happening and how to fix it. Thanks, DKMan
