Attach csv file to email in certain forms

HI

I have the following code to attach documents in my functions.php file, if I wanted to add a file ID with the csv attached how would I amend the code so that it still sends these files and the csv to another form, for example form 1?
CODE in functions.php:

<?php
add_filter("gform_user_notification_attachments", "add_attachment", 10, 3);
function add_attachment($attachments, $lead, $form) {

    if ( $form[ 'id' ] == 17 )  {
        $doc = '/The-Membership-Rules.pdf';
    } elseif( $form[ 'id' ] == 22 ) {
        $doc = '/The-Membership-Rules.pdf';
    } else {
      $doc = '';
    }

    $upload = wp_upload_dir();
    $upload_path = $upload["basedir"];

    $attachments = array();
    $attachments[] = $upload_path . $doc;

    return $attachments;

}
?>

Thanks
Nic

HI

This part works fine and when a person fills in one of the above forms they receive the pdf, however I would like to be able to add so that if someone fills in form ID 20 for example that it sends them the csv file for that form and sends it as an attachment in the same email.
Is this possible?

Thank you
Nic