not all of the code changes are needed, you will just need to click the lightning bolt next to entered value, and select the Server directory variable, the code created will look like:
<?php echo $WA_DFP_UploadStatus["WA_UploadResult1"]["serverDirectory"]; ?>
copy that, as long as you are copying the code that is created in the wizard, it will be correct for you.
Then cleck the lightnkng bolt again and select the server file name, this will create code similar to:
<?php echo $WA_DFP_UploadStatus["WA_UploadResult1"]["serverDirectory"]; ?><?php echo $WA_DFP_UploadStatus["WA_UploadResult1"]["serverFileName"]; ?>
past the server directory code in front of it so the full string looks like:
<?php echo $WA_DFP_UploadStatus["WA_UploadResult1"]["serverDirectory"]; ?><?php echo $WA_DFP_UploadStatus["WA_UploadResult1"]["serverFileName"]; ?>