I see you asked a similar question back in 2022, not sure if the answer Ray gave would still be applicable: https://www.webassist.com/forums/posts.php?id=46336
If that doesn't solve it, try using the Server Name binding for the file upload from the Bindings panel (see attached example screenshot).
<?php echo $WA_DFP_UploadStatus["WA_UploadResult1"]["WA_UploadResult1_1"]["serverFileName"]; ?>
