the code is not that complicated once you figure out What forms is doing. I have modified code previously provided by other users to actually display the form. I have created a Preview button that will display the attached documents but you can have it automatically load those. I would not have been able to do this without the prior individuals that added the ability to display pictures in a form.

$("#q11").click(function () {
    var imlp = ['pdf','PDF']
    $('.files tbody tr').each(function() {
      if ($(this).find('a').length && $.inArray($(this).find('a').attr('title').match(/\.(\w{3,4})$/)[1],imlp)>-1) {

        var ims = $(this).find('a').attr('href'),
            imrp = $('<object id="pdf" type="application/pdf" style="height: 600px;width: 600px;" />');
        imrp.attr('data',ims);
        
        $('<tr><td colspan=3>'+imrp.prop('outerHTML')+'</td></tr>').insertAfter($(this).find('a').closest('tr'));

      }
      

    });
  $("#q11").addClass('hidden');

});

Q11 is just a preview button but you can change the event to $(document).ready(function () { and the PDFs will display for every user after initial submission.