show media with MediaPress activity comments

/**
 * Attach media with comments on a mediapress activity.
 *
 * @param int $comment_id comment id.
 * @param array $r args.
 * @param BP_Activity_Activity $activity activity object.
 */
function mpp_custom_comment_posted( $comment_id, $r, $activity ) {

	$comment   = new BP_Activity_Activity( $comment_id );
	$parent_id = $comment->item_id;
	$parent    = new BP_Activity_Activity( $parent_id );
	if ( 'mpp_media_upload' !== $parent->type ) {
		return;
	}

	$attached_ids = mpp_activity_get_attached_media_ids( $comment->item_id );
	if ( ! $attached_ids || count( $attached_ids ) > 1 ) {
		return;
	}

	$media_id = current( $attached_ids );
	mpp_activity_update_media_id( $comment_id, $media_id );
}

add_action( 'bp_activity_comment_posted', 'mpp_custom_comment_posted', 10, 3 );