Wordpress Snippet: Shortcode to loop through custom post type with pagination

gistfile1.txt

<?php
/**
 * Edited loop code from: https://wpza.net/how-to-paginate-a-custom-post-type-in-wordpress/
 */
 
 
add_shortcode( 'display_whitepapers', 'sz_display_whitepapers_shortcode' );

function sz_display_whitepapers_shortcode( $atts) {


	$paged = ( get_query_var( 'paged' ) ) ? get_query_var( 'paged' ) : 1;
	$args = array(
		 'post_type' => 'sz_whitepaper',
		 'posts_per_page' => 10,
		 'paged' => $paged
	);
	ob_start();
	$loop = new WP_Query( $args );
	if ( $loop->have_posts() ) { 
		echo '<div class="sz-grid-whitepapers">';
		while ( $loop->have_posts() ) : $loop->the_post();
		    $file = get_field( 'whitepaper_file' );
			echo '<div class="sz-grid-item">';
			echo '<a href="'. esc_url( $file ) . '" class="sz-grid-image">';
			echo get_the_post_thumbnail();
			echo '</a>';
			echo '<div class="sz-grid-content"><div>';
			echo '<h3><a href="' . esc_url( $file ) . '">' . get_the_title() . '</a></h3>';
			echo the_content();
			echo '</div>';
			echo '<div><a class="button" href="' . esc_url( $file ) . '">Download</a></div></div></div>';
		endwhile;
		?>
		<div class="pagination">
			 <?php
			 $big = 999999999;
			 echo paginate_links( array(
				  'base' => str_replace( $big, '%#%', get_pagenum_link( $big ) ),
				  'format' => '?paged=%#%',
				  'current' => max( 1, get_query_var('paged') ),
				  'total' => $loop->max_num_pages,
				  'prev_text' => '&laquo;',
				  'next_text' => '&raquo;'
			 ) );
		?>
		</div>
		
	<?php
	}	
	wp_reset_postdata();
	return ob_get_clean();
}