title: "Missing click tag" despite Google Ad Manager tap area exit event
body: <p>In <a href="https://en.wikipedia.org/wiki/Google_Web_Designer" rel="nofollow noreferrer">Google Web Designer</a>, I want to create an HTML5 ad.</p>
  
  <p>I added a tap area and set its "<em>Metrics ID</em>" to "<em>clickTag</em>":</p>
  
  <p><a href="https://i.stack.imgur.com/UYbOW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UYbOW.png" alt="Tap area clickTag"></a></p>
  
  <p><strong>Problem</strong>: When importing the resulting ZIP into <a href="https://en.wikipedia.org/wiki/Google_Ad_Manager" rel="nofollow noreferrer">Google Ad Manager</a>, I get an error:</p>
  
  <p><a href="https://i.stack.imgur.com/9sqXf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9sqXf.png" alt="Missing click tag. Add a valid click tag or exit function before uploading the creative to Ad Manager."></a></p>
  
  <p>What am I doing wrong?</p>
  
  <p>By the way:</p>
  
  <ul>
  <li>Google Web Designer does not generate <code>var clickTag</code>, which is probably the problem.</li>
  <li>The same message appears with <a href="http://gwd-template://Standard%20Banner%20Static" rel="nofollow noreferrer">this official template</a> (<a href="https://www.richmediagallery.com/create/templates#tplGeneratorPath:inpage%2F300x250%2Fimage%2Fborder%3Dfalse~" rel="nofollow noreferrer">web</a>) even though it contains an exit event.</li>
  <li>I know it is not Ad Manager, but <a href="https://support.google.com/dcm/answer/3145300#40" rel="nofollow noreferrer">Campaign Manager's official documentation</a> describes what I did, stressing that "<em>No custom code is required"</em>.</li>
  </ul>