It is set to ‘File Object’. Using an example from the link you provided, I slightly modified the code, but it still doesn’t work:
<?php
// check for rows (parent repeater)
if( have_rows('downloads') ): ?>
<div id="downloads">
<?php
// loop through rows (parent repeater)
while( have_rows('downloads') ): the_row();
?>
<div class="downloads-title">
<h3><?php the_sub_field('downloads_title'); ?></h3>
<i class="downloads-border"></i>
<?php
// check for rows (sub repeater)
if( have_rows('documents') ):
?>
<ul class="fa-ul">
<?php
// loop through rows (sub repeater)
while( have_rows('documents') ): the_row();
// display each item as a list - with a class of completed ( if completed )
$file = get_sub_field('document_upload');
?>
<li><i class="fa-li fa fa-download"></i><a href="<?php echo $file['url']; ?>"><?php the_sub_field('document_name'); ?></a></li>
<?php endwhile; ?>
</ul>
<?php endif; //if( get_sub_field('documents') ): ?>
</div>
<?php endwhile; // while( have_rows('downloads') ): ?>
</div>
<?php endif; // if( have_rows('downloads') ): ?>
