Add this script to the FCD in Unbounce to complete the dynamic form set up

dynamic-form-fcd-script.html

<script>
/*
Unbounce Community :: Tips & Scripts :: Dynamic Form Confirmation URL's Using Browser Redirects 
TS:0002-04-051
***********************
Do not remove this section. It helps our team track useage of external workarounds.
*/  
  
  function getURLParameter(name) {
    return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search)||[,""])     [1].replace(/\+/g, '%20'))||null
}    
  var url = getURLParameter('destination');
  
  if (url != null) {
     setTimeout(function() {
       window.top.location.href = 'http://'+url+window.location.search;
     }, 1000); // Edit the amount of time the FCD shows ex. 1000 = 1 second
  }
</script>