title: Dropzone Accepted Files Issue
body: <p>I have set Dropzone to only allow PDfs</p>
  
  <pre><code>acceptedFiles: "application/pdf"
  </code></pre>
  
  <p>However whenever I upload a PDF it throws an error. In the response it is stating that the file I tried uploading was an unkown file type.</p>
  
  <pre><code>type: "unknown/data"
  </code></pre>
  
  <p>I am not sure how to handle this or fix it. I have tried multiple PDF files from all different sources.</p>