title: In CarrierWave, what does retrieve_from_store! do?
body: <p>The <a href="http://www.rubydoc.info/gems/carrierwave/CarrierWave/Uploader/Store#retrieve_from_store%21-instance_method" rel="noreferrer">documentation</a> says about <code>retrieve_from_store!</code>:</p>
  
  <blockquote>
    <p>Retrieves the file from the storage.</p>
  </blockquote>
  
  <p>But when I call the method, rather than getting something like a file, I just get an array returned:</p>
  
  <pre><code>irb(main):008:0&gt; uploader.retrieve_from_store!('my_file.png')
  =&gt; [:retrieve_versions_from_store!]
  </code></pre>
  
  <p>What exactly does the method do?</p>