MODX revo how to submit a form file via phpmailer

<script> $("#main-pofo").submit(function() { var th = $(this); $.ajax({ type: "POST", url: "/assets/php/phone.php", data: th.serialize() }).done(function() { $(th).find(".success").addClass("active").fadeIn(); setTimeout(function() { $(th).find(".success").removeClass("active").fadeOut(); th.trigger("reset"); }, 1000); }); return false; }); </script> 

 <form id="main-pofo" method="post"> <input type="text" name="name"> <input type="file" name="file"> </form> //собственно сам файл phone.php <?php use PHPMailer\PHPMailer\PHPMailer; use PHPMailer\PHPMailer\Exception; require 'src/Exception.php'; require 'src/PHPMailer.php'; require 'src/SMTP.php'; $name = $_POST['user_name']; $email = $_POST['user_mail']; $message = $_POST['user_msg']; $phone = $_POST['user_phone']; $mail = new PHPMailer(true); try { //Server settings $mail->SMTPDebug = 2; $mail->isSMTP(); $mail->Host = '********'; $mail->SMTPAuth = true; $mail->Username = '********'; $mail->Password = '*******'; $mail->SMTPSecure = 'ssl'; $mail->Port = 465; $mail->CharSet = 'utf-8'; //Recipients $mail->setFrom(********); $mail->addAddress(*******); //$mail->addAddress('ellen@example.com'); //$mail->addReplyTo('info@example.com', 'Information'); //$mail->addCC('cc@example.com'); //$mail->addBCC('bcc@example.com'); // Attachments //$mail->addAttachment('/var/tmp/file.tar.gz'); // Add attachments //$mail->addAttachment('/tmp/image.jpg', 'new.jpg'); // Optional name $mail->addAttachment($_FILES['file']['tmp_name'], $_FILES['file']['name']); // Content $mail->isHTML(true); // Set email format to HTML $mail->Subject = 'С сайта ******'; $mail->Body = "<br><b>ФИО или организация:</b>$name<br><b>Email:</b>$email<br><b>Телефон:</b>$phone <br><b>Сообщение:</b>$message"; $mail->AltBody = 'Что-то пошло не так и поэтому здесь этот текст'; ?>