How to include pagination in a Wordpress Custom Post Type Query

I have the code below:

<?php $the_query = new WP_Query( 'posts_per_page=30&post_type=phcl' ); ?>

<?php while ($the_query -> have_posts()) : $the_query -> the_post(); ?>

<div class="col-xs-12 file">
    <a href="<?php echo $file; ?>" class="file-title" target="_blank">
        <i class="fa fa-angle-right" aria-hidden="true"></i> 
        <?php echo get_the_title(); ?>
    </a>
    <div class="file-description">
        <?php the_content(); ?>
    </div>
</div>
<?php endwhile; wp_reset_postdata(); ?>

I am trying to use paginate_links Wordpress function but no matter where I put it, I can't make it work. Can someone help me with this?

Try the code below:

    $the_query = new WP_Query( array('posts_per_page'=>30,
                                 'post_type'=>'phcl',
                                 'paged' => get_query_var('paged') ? get_query_var('paged') : 1) 
                            ); 
                            ?>
<?php while ($the_query -> have_posts()) : $the_query -> the_post(); ?>
<div class="col-xs-12 file">
<a href="<?php the_permalink(); ?>" class="file-title" target="_blank">
<i class="fa fa-angle-right" aria-hidden="true"></i> <?php echo get_the_title(); ?>
</a>
<div class="file-description"><?php the_content(); ?></div>
</div>
<?php
endwhile;

$big = 999999999; // need an unlikely integer
 echo paginate_links( array(
    'base' => str_replace( $big, '%#%', get_pagenum_link( $big ) ),
    'format' => '?paged=%#%',
    'current' => max( 1, get_query_var('paged') ),
    'total' => $the_query->max_num_pages
) );

wp_reset_postdata();