Upgrade to wordpress 5.6 FileUpload not working

Dear Support
Wordpress 5.6 change the JQuery Libery from 1.12.x auf 3.5.x.After the upgrade the upload is not working anymore. Following error was locked in the console.
Can you give me an advice to get rit of this error?
​
Best Regards
Collie-IT

Found some further informations. In wp-content\plugins\chronoforms\chronog3\assets\js\g3.forms.js in $.G3.forms.initializeForm jQuery.fn.form is undefinedIf I change the beginning as following the error disapeared and I can use the fileuploade again

(function($){
 if($.G3 == undefined){
 $.G3 = {};
 }
 $.G3.forms = {};
 var settings= jQuery.fn.form.settings;
 $.G3.forms.quickUpload = function(Widget, requestData){
 $.ajax({
 xhr: function(){
 var xhr = new window.XMLHttpRequest();
 xhr.upload.addEventListener('progress', function(evt){
 if(evt.lengthComputable){
 var percentComplete = evt.loaded / evt.total;
 percentComplete = parseInt(percentComplete * 100);
 console.log(percentComplete);
 // $(Widget).find('.progress').progress('set percent', percentComplete);
 
 if(percentComplete === 100){
 //container.find('.progress').hide();
 }
 }
 }, false);
 return xhr;
 },
 url: $(Widget).data('url'),
 type: "POST",
 data: requestData,
 processData: false,
 contentType: false,
 beforeSend: function(){
 $(Widget).addClass('ui form loading');
 },
 error: function(xhr, textStatus, message){
 $(element).removeClass('loading');
 alert(textStatus+':'+message);
 },
 success: function(data, textStatus, xhr){
 $(Widget).removeClass('ui form loading');
 //$(Widget).append(data);
 }
 });
 }
 
 $.G3.forms.initializeForm = function (Form){
 var validationRules = {};

 settings.rules.required = function(value){
 if(value){
 return true;
 }else{
 return false;
 }
 };
 
 settings.rules.email = function(value){
 if(value.match(/^([a-zA-Z0-9_\.\-\+%])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{1,11})+$/)){
 return true;
 }else{
 return false;
 }
 };
 
 settings.rules.minChecked = function(value, minChecked){
 jQuery(this).closest('.mainfield').off('change.validation').on('change.validation', ':input', function(){
 Form.form('validate form');
 });
 
 if(jQuery(this).closest('.mainfield').find(':input:checked').length >= minChecked){
 return true;
 }else{
 return false;
 }
 };
 
 settings.rules.maxChecked = function(value, maxChecked){
 jQuery(this).closest('.mainfield').off('change.validation').on('change.validation', ':input', function(){
 Form.form('validate form');
 });
 
 if(jQuery(this).closest('.mainfield').find(':input:checked').length > maxChecked){
 return false;
 }else{
 return true;
 }
 };