title: SWIFT: NSData contentsOfUrl returns nil from valid URL
body: <p>I have an URL (NOT A path or a string): <code>file:///private/var/mobile/Containers/Data/Application/50558DAA-7082-4BB0-AB0C-F7BA0DC483E5/tmp/yFFaofWcIWln-SCVideo-Merged.mp4</code></p>
  
  <p>When I use <code>NSData(contentsOfUrl: url)</code> i get <code>nil</code>.</p>
  
  <p>I have tried same code with an asset from library URL without any problems.</p>
  
  <p>Is there a difference in the two URLS?
  Anybody knows how to extract NSData from the above URL?</p>
  
  <p>Thanks in advance</p>
  
  <p>EDIT: Seems like there was a problem with the actual file, for some reason it contained only audio and no video. Needs further investigating.
  Thanks for your contributions.</p>