Featured image not showing up

This is the code i found in the content php file

<?php
/**
* The template used for displaying page content in page.php
*
* @package ThemeGrill
* @subpackage Ample Pro
* @since Ample 1.0
*/
?>

<article id=”post-<?php the_ID(); ?>” <?php post_class(); ?>>
<?php do_action( ‘ample_before_post_content’ ); ?>

<div class=”entry-content”>
<?php the_content(); ?>
</div>

<?php
wp_link_pages( array(
‘before’ => ‘<div style=”clear: both;”></div><div class=”pagination clearfix”>’ . __( ‘Pages:’, ‘ample’ ),
‘after’ => ‘</div>’,
‘link_before’ => ‘<span>’,
‘link_after’ => ‘</span>’,
) );

edit_post_link( __( ‘Edit’, ‘ample’ ), ‘<span class=”edit-link”>’, ‘</span>’ );

do_action( ‘ample_after_post_content’ ); ?>
</article>

I found an article you guys posted about putting in this code under

<?php if ( has_post_thumbnail() ) { ?>
<div class=”featured-image”>
<?php the_post_thumbnail( ‘colormag-featured-image’ ); ?>
</div>
<?php } ?>

this section-
<?php do_action( ‘ample_before_post_content’ ); ?>

I understand that was for colormag but i changed the name to ample and still, the featured image doesn’t show up.

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