Add Downloadable Products to Woocommerce Completed Order & Invoice Emails as Attachments

woocommerce_emails_attach_downloadables.php

<?php
// Add Downloadable Products to Woocommerce Completed Order & Invoice Emails as Attachments
function woocommerce_emails_attach_downloadables($attachments, $status, $order) {

    if ( ! is_object( $order ) || ! isset( $status ) ) {
        return $attachments;
    }

    if ( empty( $order ) ) {
        return $attachments;
    }

    if ( ! $order->has_downloadable_item() ) {
        return $attachments;
    }

    $allowed_statuses = array( 'customer_invoice', 'customer_completed_order' );

    if ( isset( $status ) && in_array( $status, $allowed_statuses ) ) {
        foreach ( $order->get_items() as $item_id => $item ) {
            foreach ( $order->get_item_downloads( $item ) as $download ) {
                $attachments[] = str_replace( content_url(), WP_CONTENT_DIR, $download['file'] );
            }
        }
    }

    return $attachments;
}
add_filter( 'woocommerce_email_attachments', 'woocommerce_emails_attach_downloadables', 10, 3);

Not work now

O cool I didn't know anyone was using it let alone it being the 'official' snippet on the website;
https://docs.woocommerce.com/document/email-faq/#section-14

From the looks of this thread you're not alone;
https://stackoverflow.com/a/53253862

Seems that WooCommerce updated the woocommerce_email_attachments filter to change the second param from $status to $email_id.

Would you mind taking a look at that stack thread & snippet @W15ER69 and letting me know if it works, if so I'd be happy to update the snippet here as it's embedded on the plugin FAQ.