Not sure why you ask for a file and then can't upload it. Here is my form with the only section that I've changed.
<?php
/*-------------------------------------------------
Form Processor Plugin
by SemiColonWeb
---------------------------------------------------*/
/-------------------------------------------------
PHPMailer Initialization Files
---------------------------------------------------/
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
require 'phpmailer/src/Exception.php';
require 'phpmailer/src/PHPMailer.php';
require 'phpmailer/src/SMTP.php';
/-------------------------------------------------
Receiver's Email
---------------------------------------------------/
$toemails = array();
$toemails[] = array(
'email' => 'sales@jpstechnologies.com', // Your Email Address
'name' => 'Sales' // Your Name
);
/-------------------------------------------------
Sender's Email
---------------------------------------------------/
$fromemail = array(
'email' => 'no-reply@jpstechnologies.com', // Company's Email Address (preferably currently used Domain Name)
'name' => 'JPS Technologies' // Company Name
);