is the actual page name in the site products_updateTEST.php?
if so, make sure you change the forms action:
<form action="products_update.php?ProductID=<?php echo($row_WADAProducts['ProductID']); ?>" method="post" enctype="multipart/form-data" name="WADAUpdateForm" id="WADAUpdateForm" >
so that it is posting to the correct page:
<form action="products_updateTEST.php?ProductID=<?php echo($row_WADAProducts['ProductID']); ?>" method="post" enctype="multipart/form-data" name="WADAUpdateForm" id="WADAUpdateForm" >