Some of the basic stuff like this is explained in the file field documentation http://www.advancedcustomfields.com/resources/file/
If you want to see everything that’s returned for the file try doing the following in your code where you’re getting the value
$file = get_sub_field('file_upload');
echo '<pre>'; print_r($file); echo '</pre>';
Here is how you show the file name
<?php
if (have_rows('file_repeater')) {
while (have_rows('file_repeater')) {
the_row();
$file = get_sub_field('file_upload');
?>
<br>
<img style="width:18px; height:10px;" src="http://www.subshunter.com/wp-content/uploads/2016/01/br.png" />
<span><?php echo $title; ?></span>
<a href="<?php echo $file['url']; ?>"><?php echo $file['filename']</a>
<?php
}
}
?>
