odoo-survey-addons/survey_attachment/templates/upload_file.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <template id="upload_file" name="Upload a file">
    <div class="input-file-container">
      <t t-if="user_input_line_upload_file">
        <t t-foreach="user_input_line_upload_file" t-as="upload_file" t-if="upload_file.question_id.id == question.id">
          <t t-if="upload_file.file_type == 'pdf'">
            <a width="100px" height="100px" t-att-href="'data:application/pdf;base64,%s' % to_text(upload_file.file)" target="_blank">Download</a>
          </t>
          <t t-if="upload_file.file_type == 'image'">
            <img width="100px" style="height: 100px;" class="img-thumbnail" t-att-src="'data:image/*;base64,%s' % to_text(upload_file.file)"/>
          </t>
        </t>
      </t>
      <t t-else="">
        <div class="file-field" >
          <input class="input-file" id="my-file" type="file" accept="image/*,application/pdf" t-att-name="prefix"/>
        </div>
        <br/>
      </t>
    </div>
    <script>
$(document).ready(function(){
  $(".img-thumbnail").click(function(){
    if ( $(this).height() == 240) {
      $(this).animate({
        opacity: '0.8',
        height: '100px',
        width: '100px',
      }, "slow");
    } else {
      $(this).animate({
        opacity: '0.8',
        height: '250px',
        width: '250px',
      }, "slow");
    }
  });
});
    </script>
  </template>

</odoo>