title: iCloud Integration for uploading and downloading files
body: <p>I want to design an app which stores documents on <code>iCloud</code>. But there are some question which has answer before doing actual implementation.</p>
  
  <p><em>The question are as follows,</em></p>
  
  <ol>
  <li>What is maximum file size to upload on iCloud?</li>
  <li>Can I programmatically calculate/know the available space on user's
  iCloud account?</li>
  <li>How can I get the event for uploading and Downloading files from
  iCloud?</li>
  </ol>
  
  <p>Can anyone please help me here ? I read the apple documentation but not understood all the things completely.</p>
  
  <p>Thanks In Advance.</p>