title: How to upload multiple files to BlobStore?
body: <p>I'm trying to upload multiple files in a form to the BlobStore.</p>
  
  <p>Form:</p>
  
  <pre><code>&lt;form action="{{upload_url}}" method="POST" enctype="multipart/form-data"&gt;
    &lt;label&gt;Key Name&lt;/label&gt;&lt;input type="text" name="key_name" size="50"&gt;&lt;br/&gt;
    &lt;label&gt;name&lt;/label&gt;&lt;input type="text" name="name" size="50"&gt;&lt;br/&gt;
    &lt;label&gt;image&lt;/label&gt;&lt;input type="file" name="image" size="50"&gt;&lt;br/&gt; 
    &lt;label&gt;thumb&lt;/label&gt;&lt;input type="file" name="thumb" size="50"&gt;&lt;br/&gt; 
    &lt;input type="submit" name="submit" value="Submit"&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>I'm then trying to fetch the BlobInfo objects for each of those files uploaded:</p>
  
  <pre><code>def post(self):
      image_upload_files = self.get_uploads('image') 
      thumb_upload_files = self.get_uploads('thumb') 
      image_blob_info = image_upload_files[0]
      thumb_blob_info = thumb_upload_files[0]
  </code></pre>
  
  <p>I'm seeing some weird behavior.  Both files are making it into the BlobStore, but I cannot figure out how to get the Keys so that I can store those on another Entity.  The code above manages to get the key for image_blob_info, but not thumb_blob_info.  I don't understand how to use get_uploads.  I want to pass multiple files through the form and then fetch them by name so I can store them in the appropriate BlobReferenceProperties on another Entity.</p>