CPT registered, but cant query attachments

Hi, first of all really nice plugin.
I have registered CPT and that works fine, i have only title + attachment available to it.

...........
$args = array(
		'labels' => $array,
		'public' => true,
    'query_var' => true,
		'has_archive' => true,
		'hierarchical' => true,
		'menu_position' => 5,
		'supports' => array('title')
	);
	register_post_type('docs',$args);

Then i made this so i have the attach button in my ADD/edit CPT DOCS screen

function my_attachments( $attachments )
{
  $args = array(
    'post_type'     => array( 'post', 'page', 'dokumenti' ),
  );

  $attachments->register( 'my_attachments', $args ); // unique instance name
}

add_action( 'attachments_register', 'my_attachments' );

And now i use this to show only attached documents of all posts from that category,

<?php
            $args = array(
            'post_type' => 'docs',
            'posts_per_page' => 5,
            );
            $loop = new WP_Query( $args );
            if ( $loop->have_posts() ) {
              while ( $loop->have_posts() ) : $loop->the_post();

?>
<?php
$attachments = new Attachments( 'attachments' );
?>
<?php if( $attachments->exist() ) : ?>
              <?php while( $attachments->get() ) : ?>
                <?php
                  $class = f_detectIcon($attachments->subtype());
                 ?>
                <li>
                  s
                  <a href="<?php echo $attachments->url(); ?>" target="_blank" class="mtli_attachment <?php echo $class; ?>" download >
                    <?php echo $attachments->field( 'title' ); ?> (<?php echo $attachments->filesize(); ?>)</a>
                </li>
              <?php endwhile; endif; ?>

              <?php
              endwhile;
            }
            wp_reset_query();
            ?>

And if i echo the_title, it works, so WP loop is ok, but none of atachments are displayed. If i hovever replace ‘post_type’ => ‘docs’ to ‘post_type’ => ‘post’ so i read attachments of default POSTS it works. Why cant i see attachments from my CPT :S

I tried var dump on $attachments, its empty. but when i read default POST in loop its ok, and shows attachments.

Thanks

https://www.ads-software.com/plugins/attachments/