title: Dropzone+Codeigniter: Undefined index:FILE
body: <p>I am trying to create an upload form with Dropzone and everything works fine in the beginning: drag&amp;drop form is shown and the previews as well. The problem comes within the controller. When I try to handle the files, the array <code>$_FILES</code> seems to be empty, and echoing it I get this:</p>
  
  <blockquote>
    <p>array (size=0)   empty</p>
    
    <p>A PHP Error was encountered</p>
    
    <p>Severity: Notice</p>
    
    <p>Message: Undefined variable: file</p>
    
    <p>Filename: controllers/excedentes.php</p>
    
    <p>Line Number: 118</p>
  </blockquote>
  
  <p>Do you have any idea what's going on in here? 
  Thanks in advance!</p>