to trouble shoot the problem, edit the Insert record behavior and set it so it will not redirect to another page.
then, add the following code at line 1:
<?php
error_reporting(E_ALL);
ini_set('display_errors','on');
?>
then on the bindings panel, expand the the WA Uploaded Files Global Status binding group and add the debug info binding to the page.
Post back with the debug info, any errors that are displayed and a copy of the page in a zip archive.