How to automatically send a file to the mail specified in the application of the site?

Question

MODX

Hello. There is a task: when sending an application on the site to a visitor, a presentation file should automatically be sent to the entered mail. I'm trying to use the phpMailer built into modx for this.
The application reaches the client, but the file is not sent to the mail entered in the capture form.
I am using this code. How to finish it for this task?

<?php
define( 'MODX_API_MODE' , true ) ;
require_once ( dirname( __FILE__) . '/index.php') ;
if ( empty( $modx )) throw new Exception( 'Core not found', 500);
//куда слать заявки
$sendto = '[email protected]';

# От кого отправляем почту - Имя
$my_name = "leader-a.ru";
# От кого отправляем почту - E-mail
$my_mail = "[email protected]";
# Почта для ответа - E-mail       
$my_replyto = "[email protected]";

$subjectuser = "Заявка с сайта leader-a.ru. Форма 'Пройти тест'";

$mes = "";
$my_file = "";

if( $_POST['user_phone'] == '' ) {
    echo 'false';
  die();
}

foreach($_POST as $k=>$v) {
    switch($k) {


        case 'user_name':
        $mes .= 'Имя: '.$_POST['user_name'].PHP_EOL;
        break;

        case 'user_phone':
        $mes .= 'Телефон: '.$_POST['user_phone'].PHP_EOL;
        break;

        case 'user_email':
        $mes .= 'E-mail: '.$_POST['user_email'].PHP_EOL;
        break;
    }
}

$mes .= 'Отправлено с сайта '.$_SERVER[HTTP_HOST];

if (!empty($_FILES['file']['tmp_name'])) {
    $path = $_FILES['file']['name'];

    if (copy($_FILES['file']['tmp_name'], $path)) {
        $my_file = $path;
    }
}

if (@mail_attachment($my_file, $sendto, $my_mail, $my_name, $my_replyto, $subjectuser, $mes)) {
    echo "true";
} else {
    echo "false";
}

if( $_POST['send'] ) {
    if( !isset($_POST['user_email']) || $_POST['user_email'] == '' ) return false;
    switch($_POST['send']) {
        case 0;
        case '0':
            return false;
        break;
        case 1:
        case '1':
            $bodyMessage = "Презентация прикреплена к письму." . PHP_EOL . "Остались вопросы звоните на мобильный [phone] "; //текст для презентации
            $file = dirname(__FILE__).'/WONDERBEAT_Prezentatsia_franshizy.pdf';
        break;
        default:
            return false;
        break;
    }
    $modx->getService('mail', 'mail.modPHPMailer');
    $modx->mail->set(modMail::MAIL_BODY, $bodyMessage);
    $modx->mail->set(modMail::MAIL_FROM,'[email protected]');
    $modx->mail->set(modMail::MAIL_FROM_NAME,'leader-a.ru');
    $modx->mail->set(modMail::MAIL_SUBJECT,'Презентация нашей фирмы');
    $modx->mail->address('to', $_POST['user_email']);
    $modx->mail->address('reply-to','[email protected]');
    $modx->mail->attach($file);
    $modx->mail->setHTML(true);
    if (!$modx->mail->send()) {
        $modx->log(modX::LOG_LEVEL_ERROR,'An error occurred while trying to send the email: '.$modx->mail->mailer->ErrorInfo);
    }
    $modx->mail->reset();
}


function mail_attachment( $filename, $mailto, $from_mail, $from_name, $replyto, $subject, $message )
{
    if ( ! empty( $filename ) )
    {
        $file = $filename;

        if ( file_exists( $file ) )
        {
            $file_size = filesize( $file );

            $handle = fopen( $file, "r" );
            $content = fread( $handle, $file_size );
            fclose( $handle );

            $content = chunk_split( base64_encode( $content ) );
            $name = basename( $file );

            unlink( $file );
        }
        else
        {
            unset( $filename );
        }
    }

    $uid = md5( uniqid( time() ) );

    $header = "From: " . $from_name . " <" . $from_mail . ">" . PHP_EOL;
    $header .= "Reply-To: " . $replyto . PHP_EOL;
    $header .= "MIME-Version: 1.0" . PHP_EOL;
    $header .= "Content-Type: multipart/mixed; boundary=\"" . $uid . "\"" . PHP_EOL . PHP_EOL;

    $nmessage = "--" . $uid . PHP_EOL;
    $nmessage .= "Content-type:text/plain; charset=utf-8 " . PHP_EOL;
    $nmessage .= "Content-Transfer-Encoding: 7bit" . PHP_EOL . PHP_EOL;
    $nmessage .= $message . PHP_EOL . PHP_EOL;

    if ( ! empty( $filename ) )
    {
        $nmessage .= "--" . $uid . PHP_EOL;
        $nmessage .= "Content-Type: application/octet-stream; name=\"" . $filename . "\"" . PHP_EOL;
        $nmessage .= "Content-Transfer-Encoding: base64" . PHP_EOL;
        $nmessage .= "Content-Disposition: attachment; filename=\"" . $filename . "\"" . PHP_EOL . PHP_EOL;
        $nmessage .= $content . PHP_EOL . PHP_EOL;
        $nmessage .= "--" . $uid . "--";
    }

    return mail( $mailto, $subject, $nmessage, $header );
}

Answer 1

<form enctype="multipart/form-data" method="post">?