title: Saving temporary image file in a session
body: <p>There is a user registration module which requires users’ logo to upload before register.
  I’m facing problem of where to store this uploaded image, because at the time user is uploading the logo, the actual user item is not created.</p>
  
  <p>As solution for that, I can think of saving the uploaded image (until create the actual user item) in a session variable. Will that be a good idea in terms of performance and longtime use of the system? </p>