title: Modification time is not updating in magnolia
body: <p>I am uploading the images and videos in magnolia stk resources module it uploading sucessfully.</p>
  
  <p>when updating or modifying the resources the maodfication date is not updating it remains same as the first uploading time.</p>
  
  <p>Can anyone suggest how to update the modification date </p>
  
  <p>Thanks in advance</p>