Aha, I missed that this was for a profile! It’s good that you’re seeing the <pre> tags, but to get user profile fields you have to pass in the user ID prepended with “user_”.
http://www.advancedcustomfields.com/resources/how-to/how-to-get-values-from-a-user/
So to get the field for user ID zero:
$user_id = 0;
$field = get_field('test_acf_upload', 'user_'.$user_id);
echo '<pre>'.print_r($field, true).'</pre>';
You could get the user ID with a variety of functions.
