I haven’t got enough points to comment a link and I don’t wish to plagiarise the answer from another website, but I hope this helps
add_action( 'publish_post', 'update_txt_file' );
add_action( 'publish_page', 'update_txt_file' );
Reference: https://wpza.net/wordpress-setup/how-to-update-a-file-after-new-post-or-page-in-wordpress/
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