[Resolved] Featured Image and Page Header with Post Content

SOLUTION
If you need to have a unique Page Header Image and a unique Feature Image for Single Posts. Here is a solution for you. Always work within the Child Theme.

PHP
Place a copy of ‘content-single.php’ in the Child Theme Folder.

I added these lines. See below where to place it.

<div class="featured-image">
	<?php the_post_thumbnail( 'full' ); ?>
</div><!-- .featured-image -->	

Add here.

<?php
/**
 * @package GeneratePress
 */
?>

<article id="post-<?php the_ID(); ?>" <?php post_class(); ?> itemprop="blogPost" itemtype="http://schema.org/BlogPosting" itemscope="itemscope">
	<div class="inside-article">
		<?php do_action( 'generate_before_content'); ?>
		<header class="entry-header">
			<?php the_title( '<h1 class="entry-title" itemprop="headline">', '</h1>' ); ?>
			<div class="entry-meta">
				<?php generate_posted_on(); ?>
				<?php generate_entry_meta(); ?>
			</div><!-- .entry-meta -->
			
		</header><!-- .entry-header -->
		
		<div class="featured-image">
			<?php the_post_thumbnail( 'full' ); ?>
		</div><!-- .featured-image -->	
		
		
		<?php do_action( 'generate_after_entry_header'); ?>
		<div class="entry-content" itemprop="text">
			<?php the_content(); ?>
			<?php
				wp_link_pages( array(
					'before' => '<div class="page-links">' . __( 'Pages:', 'generate' ),
					'after'  => '</div>',
				) );
			?>
		</div><!-- .entry-content -->
		
		<?php do_action( 'generate_after_entry_content'); ?>

		<footer class="entry-meta">
			
			<?php generate_content_nav( 'nav-below' ); ?>
			<?php edit_post_link( __( 'Edit', 'generate' ), '<span class="edit-link">', '</span>' ); ?>
		</footer><!-- .entry-meta -->
		<?php do_action( 'generate_after_content'); ?>
	</div><!-- .inside-article -->
</article><!-- #post-## -->

CSS
Add this your Child Theme CSS:
.featured-image img{width:100%;margin:20px 0 !important}

Enjoy!

I am learning little by little. Sweet. Works like a charm. We can mark this complete.

Cheers!