อัพเดทรูปภาพไม่ได้ แก้ยังไงครับ มันไม่ยอมอัพเดทให้?

<?php
include('connect.php');
	if (isset($_POST['edit_p'])) {
		$pname 		= $_POST['epname'];
		$price 		= $_POST['epprice'];
		$pcat 		= $_POST['epcat'];
		$pdetails 	= $_POST['epdetails'];
		$pid 		= $_GET['product_id'];
		
		// Check connection
		if ($con->connect_error) {

		die("Connection failed: " . $con->connect_error);

		}
		//////////////
			if (isset($_FILES['filUpload']['name']) && $_FILES['filUpload']['name'] != '') {
				@unlink($_POST['hdnOldFile']);
				$target_dir = "uploads/";
				$target_file = $target_dir . basename($_FILES["filUpload"]["name"]);
				move_uploaded_file($_FILES["filUpload"]["tmp_name"], $target_file);
				$save_img = $target_file;
			} else {
				$save_img 	= $_POST['hdnOldFile'];
			}
		///////////////
		print_r($save_img);
		$sql = mysqli_query($con,
			"UPDATE products SET 
			product_name = '$pname',
			product_price = '$price',
			product_cat = '$pcat',
			product_details = '$pdetails',
			img_location = '$save_img'
			WHERE product_id = '$pid'
		");			
		mysqli_close($con); //ปิดการเชื่อมต่อ database 
	
		if($sql){
			echo "<script type='text/javascript'>";
			echo "alert('แก้ไขสินค้าเรียบร้อย');";
			//echo "window.location = 'index.php'; ";
			echo "</script>";
		} else {
			echo "<script type='text/javascript'>";
			echo "alert('ไม่สามารถแก้ไขสินค้าได้ กรุณาลองใหม่อีกครั้ง');";
			echo "window.location = 'index.php'; ";
			echo "</script>";
		}
	}
?>