Posts will not display on page-mypage.php

You can use custom query to show post in your template

$args = array(
    'post_type' => 'product',
    'posts_per_page' => 10
  );
  $loop = new WP_Query( $args );
  while ( $loop->have_posts() ) : $loop->the_post();
    the_title();
    the_content();
  endwhile;