add_filter( 'upload_dir', 'change_upload_dir' );

	function change_upload_dir( $param ) {
		$currentCPT = get_current_post_type();
		if ( $currentCPT === 'rsg_download' ) {
			$mydir         = '/rsg-uploads';
			$param['path'] = $param['basedir'] . $mydir;
			$param['url']  = $param['baseurl'] . $mydir;
		//	var_dump( wp);
		}
		return $param;
	}


	function get_current_post_type() {
		global $post, $typenow, $current_screen;

		//we have a post so we can just get the post type from that
		if ( $post && $post->post_type ) {
			return $post->post_type;
		} //check the global $typenow - set in admin.php
		elseif ( $typenow ) {
			return $typenow;
		} //check the global $current_screen object - set in sceen.php
		elseif ( $current_screen && $current_screen->post_type ) {
			return $current_screen->post_type;
		} //lastly check the post_type querystring
		elseif ( isset( $_REQUEST['post_type'] ) ) {
			return sanitize_key( $_REQUEST['post_type'] );
		}

		//we do not know the post type!
		return NULL;
	}