Portfolio featured image and description text not showing up

The featured image and description are not showing up. I have tried redoing the plugin options and followed some of the suggestions that was in the community. Also added add_theme_support( 'post-thumbnails' ); in the functions.php. Please help.

Here is my code for the page-portfolio:

<?php /*Template Name: Portfolio Page */ ?>

<?php get_header(); ?>

<section class="row"> <div class="small-12 columns text-center"> <div class="leader">

<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

  <h1><?php the_title(); ?></h1>      
  <?php the_content(); ?>       

<?php endwhile; endif; ?>

</div>

</div> </section>

<?php

$args = array ( 'post_type' => 'portfolio' ); $query = new WP_Query($args);

?>

<section class="row no-max pad">

<?php if( $query->have_posts() ) : while( $query->have_posts() ) : $query->the_post(); ?>

  <div class="small-6 medium-4 large-3 columns grid-item">
    <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('large'); ?> Hello there</a>
  </div>

<?php endwhile; endif; wp_reset_postdata(); ?>

</section> <?php get_footer(); ?>