title: Android Studio not able to find drawable resource for ImageView
body: <p>I am using Android Studio 3.0.1, I have a simple xml file with root <code>ConstraintLayout</code>, so when I do preview and <code>drag and drop</code> an <code>ImageView</code> from the <code>Preview</code> <code>Palette</code>, it is not able to find the new added png file, which I have copy/paste directly in the project directory, not in <code>Android Studio.</code></p>
  
  <p><a href="https://i.stack.imgur.com/TJNEq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TJNEq.png" alt="enter image description here"></a></p>
  
  <p>I have tried clean, rebuild but it is still not able to find the image.</p>
  
  <p>I know that it will work if I <code>restart</code> it but I think that it is not a good idea to <code>restart</code> each and every time I add a new png file.</p>
  
  <p>Is this a bug in <code>Android Studio</code>? </p>
  
  <p>Have anyone else experienced this?</p>