Exclude attachments from getting deleted using the Bulk Delete Attachments add-on for Bulk Delete plugin

exclude-attachments.php

<?php
add_filter( 'bd_delete_attachment_excluded_attachment_ids', 'prefix_exclude_attachment_ids_from_deletion' );
function prefix_exclude_attachment_ids_from_deletion( $attachment_ids ) {
    return array(
        100,
        111,
        112,   
    );
}