taxonomy-portfolio_tag.php

<?php
/**
 * The template for displaying portfolio tag pages
 *
 * Used to display archive-type pages for portfolio posts.
 * If you'd like to further customize these taxonomy views, you may create a
 * new template file for each specific one.
 *
 * @link http://codex.wordpress.org/Template_Hierarchy
 *
 * @package     Plate
 * @link        https://themebeans.com/themes/plate
 */

get_header();

get_template_part( 'template-parts/portfolio' );

get_footer();