WP_REST_Attachments_Controller::handle_featured_media( int $featured_media, int $post_id ): bool|WP_Error

363	protected function handle_featured_media( $featured_media, $post_id ) {364		$post_type         = get_post_type( $post_id );365		$thumbnail_support = current_theme_supports( 'post-thumbnails', $post_type ) && post_type_supports( $post_type, 'thumbnail' );366 367		// Similar check as in wp_insert_post().368		if ( ! $thumbnail_support && get_post_mime_type( $post_id ) ) {369			if ( wp_attachment_is( 'audio', $post_id ) ) {370				$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );371			} elseif ( wp_attachment_is( 'video', $post_id ) ) {372				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );373			}374		}375 376		if ( $thumbnail_support ) {377			return parent::handle_featured_media( $featured_media, $post_id );378		}379 380		return new WP_Error(381			'rest_no_featured_media',382			sprintf(383				/* translators: %s: attachment mime type */384				__( 'This site does not support post thumbnails on attachments with MIME type %s.' ),385				get_post_mime_type( $post_id )386			),387			array( 'status' => 400 )388		);389	}