使用phpMailer和PHP从表单发送文件附件

Question

I have a form on example.com/contact-us.php that looks like this (simplified):

<form method="post" action="process.php" enctype="multipart/form-data">
  <input type="file" name="uploaded_file" id="uploaded_file" />
  <input type="hidden" name="MAX_FILE_SIZE" value="10000000" />
</form>

In my process.php file, I have the following code utilizing PHPMailer() to send an email:

require("phpmailer.php");

$mail = new PHPMailer();

$mail->From     = [e-mail];
$mail->FromName = My name;
$mail->AddAddress([e-mail],"John Doe");

$mail->WordWrap = 50;
$mail->IsHTML(true);

$mail->Subject  =  "Contact Form Submitted";
$mail->Body     =  "This is the body of the message.";

The email sends the body correctly, but without the Attachment of uploaded_file.

MY QUESTION

I need the file uploaded_file from the form to be attached to the email, and sent. I do NOT care about saving the file after the process.php script sends it in an email.

I understand that I need to add AddAttachment(); somewhere (I'm assuming under the Body line) for the attachment to be sent. But...

1. What do I put at the top of the process.php file to pull in the file uploaded_file? Like something using $_FILES['uploaded_file'] to pull in the file from the contact-us.php page?
2. What goes inside of AddAttachment(); for the file to be attached and sent along with the email and where does this code need to go?

Please help and provide code!Thanks!