You need to use the absolute path to the file in order to add an attachment.
You can probably use realpath() in order to translate your relative path to the correct absolute path.
function.realpath.php
it will end up looking something like:
$WA_MailObject = WAUE_AddAttachment($WA_MailObject,realpath("/home/u7200157/tylattimorexxx.com/tour/temp_upload/".$WA_DFP_UploadStatus["WA_UploadResult1"]["serverFileName"]) ."");