title: Can I use UUID as my image file name for uniquness?
body: <p>I am naming the image file in my rails app with UUID, e.g.<code>67bc91b6-fdb3-11e0-bbff-f04da2baa2d4.png</code>
  However, I was not able to display this image correctly in my page, any clue on why this happens?</p>