PHPMailer: Attach a file located on server - php

Question

I'm trying to send an (up to 4) attachments using PHPMailer. The files are on my server.
This is how my script works:
User sees a job or resume and contacts them by using the contact form. The contact form stores the data along with the attachments on the server. We will then review the message filtering out spams/scams. If the message is genuine then we will send the message through.
I have the information stored on the server and Im able to send that information via email however the attachments are not sending.
Here is the code used to send the mail:
if ($_GET['status'] == 'approve') {
$id = $_GET['id'];
dbconnect($dbuser, $dbpass, $db);
$sql = "SELECT * FROM $db.mail WHERE id = $id";
$results=mysql_query($sql) or die(mysql_error());
while($row = mysql_fetch_array($results, MYSQL_ASSOC)) {
$id = $row["id"];
$to = $row["to"];
$from = $row["from"];
$subject = $row["subject"];
$message = $row["message"];
$file1 = $row["file1"];
$file2 = $row["file2"];
$file3 = $row["file3"];
$file4 = $row["file4"];
$result = mysql_query("UPDATE mail SET `status` = '1', `approvedtime` = NOW() WHERE id = " . $_GET['id'])
or die(mysql_error());
header("Location: mail.php");
// PHPMailer - Start
$email = new PHPMailer();
$email->setLanguage('ja');
$email->From = $from;
$email->FromName = 'MySite.com';
$email->Subject = $subject;
$email->Body = $message;
$email->addAddress($to);
if (!empty($file1)) {
$file1 = 'upload/'.$file1;
$email->AddAttachment($file1);
}
if (!empty($file2)) {
$file2 = 'upload/'.$file2;
$email->AddAttachment($file2);
}
if (!empty($file3)) {
$file3 = 'upload/'.$file3;
$email->AddAttachment($file3);
}
if (!empty($file4)) {
$file4 = 'upload/'.$file4;
$email->AddAttachment($file4);
}
return $email->Send();
// PHPMailer - Start
}
} elseif ($_GET['status'] == 'reject') {
dbconnect($dbuser, $dbpass, $db);
$result = mysql_query("UPDATE mail SET `status` = '2', `approvedtime` = NOW() WHERE id = " . $_GET['id'])
or die(mysql_error());
header("Location: mail.php");
}
Why are the attachments not sending? Am I missing a step in my code or have something incorrect?
Thanks for the help!