Hi Gusy just customize the plugin
open plugin folder find the file name inside classes folder AdminGuiFiles.php add mail function after this line $message = $update?__('File updated.', WPFB):__('File added.', WPFB);
like
<?php
$to = 'nobody@example.com';
$subject = 'the subject';
$message = 'hello';
$headers = 'From: webmaster@example.com' . "\r\n" .
'Reply-To: webmaster@example.com' . "\r\n" .
'X-Mailer: PHP/' . phpversion();
mail($to, $subject, $message, $headers);
?>