title: Sharing data in the documents directory in iPhone and Watch app
body: <p>How do I use App Groups to share data, such as images, in the documents directory?</p>
  
  <p>If this is not possible what is the best way to share images between the Watch App and the iPhone app? I can store the image binary data in coredata but this is not very efficient. I can also accomplish this using NSUserDefaults but again this is not efficient.</p>