I added a hack for this if anyone is interested

#added new function in email_api.php
function email_file_add( $p_bug_id ) {
email_generic( $p_bug_id, 'fileupload', 'email_notification_title_for_action_fileupload_submitted' );
}

#added new string in strings_english.txt

$s_email_notification_title_for_action_fileupload_submitted = "A FILE has been added to this issue.";

#added new email function to the bug_file_add.php
email_file_add( $f_bug_id );