phpmailer without using composer on c-panel

Question

Hi Team

I sincerely need something important right, i have downloaded using composer require phpmailer/phpmailer on my command prompt. Now i want to use these files on external server(c-panel) and have them on this directory under this code below. Question will i still accomplished to send email with attachment pdf? Need some steps perhaps in terms of following them to accomplished without any issue. 

 

<?php

        $mailto = $_POST['mail_to'];
        $mailSub = $_POST['mail_sub'];
        $mailMsg = $_POST['mail_msg'];
       require 'lib/vendor/phpmailer/phpmailer';
       $mail = new PHPMailer();
       $mail ->IsSmtp();
       $mail ->SMTPDebug = 0;
       $mail ->SMTPAuth = true;
       $mail ->SMTPSecure = 'ssl';
       $mail ->Host = "smtp.gmail.com";
       $mail ->Port = 465; // or 587
       $mail ->IsHTML(true);
       $mail ->Username = "[email protected]";
       $mail ->Password = "accountsamplepassword";
       $mail ->SetFrom("[email protected]");
       $mail ->Subject = $mailSub;
       $mail ->Body = $mailMsg;
       $mail ->AddAddress($mailto);
       $mail->AddAttachment('pdf_files/reservation.pdf', 'reservation.pdf');


       if(!$mail->Send())
       {
           echo "Mail Not Sent";
       }
       else
       {
           echo "Mail Sent";
       }

    ?>