instead of this: jQuery('#wpuf_new_post_form').submit(function(e) {

Try this way, it should work for you.

jQuery(document).on("submit", "#wpuf_new_post_form" , (function(e)) {

var data2 = jQuery('#wpuf_new_post_form').serialize();

first do console.log(data2)

try it, should print entire form 's data in console.

instead of this:

jQuery('#wpuf_new_post_form').submit(function(e) {

Try this way, it should work for you.

jQuery(document).on("submit", "#wpuf_new_post_form" , (function(e)) {

    var data2 = jQuery('#wpuf_new_post_form').serialize();

first do console.log(data2)

try it, should print entire form 's data in console.