that href will not work, and the href should not be in the WAUE_AddAttachment function.
it will need to be in the email, and the correct href code is:
<a href="http://www.mydomian.com/path/to/file/<?php echo $WA_DFP_UploadStatus["WA_UploadResult1"]["serverFileName"]; ?>"><?php echo $WA_DFP_UploadStatus["WA_UploadResult1"]["serverFileName"]; ?></a>