Snippet to add other custom post types to WordPress author archive

add-other-author-cpt.php

<?php

add_filter( 'pre_get_posts', 'add_post_types_to_archives' );
function add_post_types_to_archives( $query ) {
	if ( is_admin() || ! $query->is_main_query() ) {
		return;    
	}

	if ( is_author() && empty( $query->query_vars['suppress_filters'] ) ) {
		$cpts = array( 'page', 'podcasts' ); // Replace with your own custom post types
		$query->set(
			'post_type',
			array_merge(
				array( 'post' ),
				$cpts
			)
		);
	}
}

?>