title: Issue while upload/send file with post request using Jmeter
body: <p>I have one post request where I am uploading image as per below using postman :</p>
  
  <p><a href="https://i.stack.imgur.com/CUMoE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CUMoE.png" alt="enter image description here"></a></p>
  
  <p>I am trying to perform same request using Jmeter. I did following setting in Jmeter :</p>
  
  <p><a href="https://i.stack.imgur.com/0cSao.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0cSao.png" alt="enter image description here"></a></p>
  
  <p>But somehow it is not working. I tried with multipart/form-data for POST option also but no luck.</p>
  
  <p>our API developer has set validation that if api get any other file then image then they send response : <code>invalid file type</code>. I am getting this response all time when do POST request with image from Jmeter. It works fine with postman.</p>
  
  <p>In Debugger post processor it shows like this : <code>HTTPsampler.Files=path:'C:\apache-jmeter-4.0\bin\samplex.png'|param:'fileName'|mimetype:'image/png'</code></p>