title: check if request file is type zip
body: <p>Im using the following code to get single files/ zip from postman.</p>
  
  <p>In the request im asking for a file original name and can check if the file <code>originalname</code> contain <code>.zip</code> or not ,is there a better way to check if it single file or zip ? </p>
  
  <pre><code>update function (req, res) {
          if (req.file) {
  </code></pre>