title: Trying to understand Django's sorl-thumbnail
body: <p>I have been playing around with <code>sorl-thumbnail</code> for Django. And trying to understand how it works better. </p>
  
  <p>I've read the guide for it, installed it in my site-packages, made sure PIL is installed correctly, put <code>sorl.thumbnail</code> in the <code>INSTALLED APPS</code> in my <strong>settings.py</strong>, put <code>from sorl.thumbnail.fields import ImageWithThumbnailsField</code> at the top in my <strong>models.py</strong>, added <code>image = ImageWithThumbnailsField(upload to="images/", thumbnail={'size':(80, 80)})</code> as one of my model fields, passed the model through my view to the template, and in the template added <code>{% load thumbnail %}</code> at the top and put in the variable <code>{{ mymodel.image.thumbnail_tag }}</code> in there too.</p>
  
  <p>But from what I understood is that when I upload an image through the admin, it would create the thumbnail straight away, but it only actually creates in when I see my template in the browser? Is this correct? The thumbnail shows fine, it looks great in fact, but I thought that adding the model field part of it would create the thumbnail instantly once the image has uploaded? ...Why not just use the <code>models.ImageField</code> in my model instead?</p>
  
  <p>...or have I done this all OK and I've just got the way it works wrong?</p>