Media Modal does not work

Hello!

I was using media modal support but now it seems that it does not work. I tested it in a localhost website and it does not work. This is my code

/***********************************************************************
 * B. ADD CUSTOM META BOXES
 * *********************************************************************/
 function colours_meta_boxes( $meta_boxes ) {
	$prefix = 'colours_';
	// attachment
	
	$meta_boxes[] = array(
		'title' => esc_html__( 'Artist Info', 'colours-of-a-journey-plugin' ),
		'post_types'  => 'attachment',
		'media_modal' => true,
		'fields' => array(
			array(
				'name'	=> esc_html__( 'Nickname', 'colours-of-a-journey-plugin' ),
				'id'	=> $prefix . 'attachment_nickname',
				'type'	=> 'text',
			),
			array(
				'name'	=> esc_html__( 'Age', 'colours-of-a-journey-plugin' ),
				'id'	=> $prefix . 'attachment_age',
				'type'	=> 'number',
			),
			array(
				'name'		=> esc_html__( 'Category', 'colours-of-a-journey-plugin' ),
				'id'		=> $prefix . 'attachment_theme_tag',
				'type'		=> 'select',
				'options'	=> array(
					'sel'		=> esc_html__( 'Select', 'colours-of-a-journey-plugin' ),
					'past'		=> esc_html__( 'Past', 'colours-of-a-journey-plugin' ),
					'present'	=> esc_html__( 'Present', 'colours-of-a-journey-plugin' ),
					'future'	=> esc_html__( 'Future', 'colours-of-a-journey-plugin' ),
				),
			),
			array(
				'id'	=> $prefix . 'attachment_painting',
				'type'	=> 'hidden',
			),
			array(
				'id'	=> $prefix . 'attachment_gallery',
				'type'	=> 'hidden',
			),
			array(
				'id'	=> $prefix . 'attachment_structure',
				'type'	=> 'hidden',
			),
		),
	);

    return $meta_boxes;
}
add_filter( 'rwmb_meta_boxes', 'colours_meta_boxes' );

If I change the post type to post it works, but if I have the post type to attachment, I cannot see the custom meta boxes in the media modal window.

Any ideas?

Thank you 🙂