auto load posts in single.php - wordpress

Question

i'm trying to auto load all my post in single.php i have tried several plugins but neither works
what's might be the problem i have also tried several nav-menu but i can't find what the problem is
i have the same problem in this question
https://wordpress.stackexchange.com/questions/102604/enable-infinite-scroll-on-single-php
this is my single page
<?php
/**
* The template for displaying all single posts
*
* #link https://developer.wordpress.org/themes/basics/template-hierarchy/#single-post
*
* #package NewsCard
*/
get_header();
newscard_layout_primary(); ?>
<main id="main" class="site-main">
<?php
while ( have_posts() ) :
the_post();
get_template_part( 'template-parts/content', get_post_type() );
the_post_navigation();
// If comments are open or we have at least one comment, load up the comment template.
if ( comments_open() || get_comments_number() ) :
comments_template();
endif;
endwhile; // End of the loop.
?>
</main><!-- #main -->
</div><!-- #primary -->
<?php
do_action('newscard_sidebar');
if ( $newscard_settings['newscard_footer_featured_posts_hide'] === 0 ) {
$footer_newscard_cat = absint($newscard_settings['newscard_footer_featured_post_categories']);
$footer_post_type = array(
'posts_per_page' => 4,
'post__not_in' => get_option('sticky_posts'),
'post_type' => array(
'post'
),
);
if ( $newscard_settings['newscard_footer_featured_latest_post'] == 'category' ) {
$footer_post_type['category__in'] = $footer_newscard_cat;
}
$footer_newscard_get_featured_post = new WP_Query($footer_post_type); ?>
<div class="container">
<section class="featured-stories">
<h2 class="stories-title"><?php echo esc_html($newscard_settings['newscard_footer_featured_posts_title']); ?></h2>
<div class="row gutter-parent-14">
<?php while ($footer_newscard_get_featured_post->have_posts()) {
$footer_newscard_get_featured_post->the_post(); ?>
<div class="col-sm-6 col-lg-3">
<div class="post-boxed">
<?php if ( has_post_thumbnail() ) { ?>
<div class="post-img-wrap">
<div class="featured-post-img">
</div>
<div class="entry-meta category-meta">
<div class="cat-links"><?php the_category(' '); ?></div>
</div><!-- .entry-meta -->
</div><!-- .post-img-wrap -->
<?php } ?>
<div class="post-content">
<?php if ( !has_post_thumbnail() ) { ?>
<div class="entry-meta category-meta">
<div class="cat-links"><?php the_category(' '); ?></div>
</div><!-- .entry-meta -->
<?php } ?>
<?php the_title( '<h3 class="entry-title">', '</h3>' ); ?>
<?php if ( 'post' === get_post_type() ) { ?>
<div class="entry-meta">
<?php newscard_posted_on(); ?>
</div>
<?php } ?>
</div><!-- .post-content -->
</div><!-- .post-boxed -->
</div><!-- .col-sm-6 .col-lg-3 -->
<?php }
// Reset Post Data
wp_reset_postdata(); ?>
</div><!-- .row -->
</section><!-- .featured-stories -->
</div><!-- .container -->
<?php }
get_footer();
?>