single-portfolio.php

<?php get_header(); ?>

    
        <?php get_template_part( 'template-parts/content', 'before' );  ?>

        <?php 
            if ( have_posts() ) : 
                // Start the loop.
                while ( have_posts() ) : the_post();
                    /*
                    * Include the Post-Format-specific template for the content.
                    * If you want to override this in a child theme, then include a file
                    * called content-___.php (where ___ is the Post Format name) and that will be used instead.
                    */
                    get_template_part( 'portfolio/content' );                 

                    // End the loop.
                endwhile;

                get_template_part( 'portfolio/related', 'portfolio' );


                // If no content, include the "No posts found" template.
                else :

                get_template_part( 'template-parts/post/content', 'none' );     

            endif;
        ?>      

        <?php get_template_part( 'template-parts/content', 'after' );   ?>
    
<?php get_footer(); ?>