To troubleshoot, lets start with the insert page.
on the insert page, change line 42:
$WA_redirectURL = "tblsuccess_results.php";
$WA_redirectURL = "";
so that the page will not redirect.
then go the the bindings panel and expand the WA Digital File pro Global Status group, add the debug info binding to the page. Please post back the debug info results after trying to upload a file.