title: How can i upload files on dropzone.js with style="display: none;" using Selenium?
body: <p>I'm trying to upload files on a website which using dropzone.js for file uploads.
  I've found the file upload field in form, but the script stops without throwing any error.
  I've also used find_elements_by_id("upload-input") to make sure there are not multiple fields with same id.</p>
  
  <pre><code>elem = driver.find_element_by_id("upload-input")
  driver.implicitly_wait(2)
  elem.send_keys("C:\KVR.pdf")
  </code></pre>
  
  <p>This is how html looks like:</p>
  
  <pre><code> &lt;div id="fallback" style="display: none;"&gt;
      &lt;input id="upload-input" type="file" name="file" multiple="multiple"&gt;
      &lt;div id="upload-progress" class="upload-progress"&gt;&lt;/div&gt;
    &lt;/div&gt;
  </code></pre>