title: NSSavePanel for saving a file after sandboxing
body: <p>I have a mac AVRecording app, which records a video and save it to a location selected via NSSavePanel. It was working fine till I sandboxed the app.</p>
  
  <p>For sandboxing I have added the following entitlements
      com.apple.security.files.user-selected.read-write
      com.apple.security.assets.movies.read-write
      com.apple.security.files.downloads.read-write
  This enables saving to Downloads and movies folder only. </p>
  
  <p>How is it possible to save my file to any desired location, Desktop, Documents etc ?  </p>