You can use the following hook:
if ( isset($GLOBALS["WFU_GLOBALS"]["WFU_DEBUG"]) ) $GLOBALS["WFU_GLOBALS"]["WFU_DEBUG"][3] = "ON";
if (!function_exists('wfu_process_files_alt')) {
function wfu_process_files_alt($res, $params, $method) {
$sid = $params["uploadid"];
$hiddeninput = 'hiddeninput_'.$sid;
$userdata_fields = $params["userdata_fields"];
$search = array ();
$replace = array ();
foreach ( $userdata_fields as $userdata_key => $userdata_field ) {
$value = ( isset($_POST[$hiddeninput.'_userdata_'.$userdata_key]) ? strip_tags($_POST[$hiddeninput.'_userdata_'.$userdata_key]) : "" );
$ind = 1 + $userdata_key;
array_push($search, '/%userdata'.$ind.'%/');
array_push($replace, $value);
}
$params['successmessage'] = preg_replace($search, $replace, $params['successmessage']);
$res["vars"]["params"] = $params;
$res["result"] = "X";
return $res;
}
add_filter('wfu_debug-wfu_process_files', 'wfu_process_files_alt', 10, 3);
$GLOBALS['wfu_debug-wfu_process_files'] = "1";
}
You need to put it in functions.php of your theme. Then, if you want to put a userdata field value, you can put %userdata1% or %userdata2% etc. inside Success Message label.
Regards
Nickolas