Post Field = Custom Field, File Upload Displayed on Single.php

I am using WP 3.2.1, and Gravity Forms 1.5.3. No other plugins and currently using Theme "twenty eleven 1.2"
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What I am doing seems to be pretty easy, but I may be missing something.

I created a GForm using the following POST Fields:
'Post Title
Post Body
Post Excerpt
Post Category
Custom Field'

The "Custom Field" in the Gravity Forms form has been named "File Upload", file type="FileUpload", Custom Field Name="file_attachment"

When users complete the form, their information is placed in the Post Drafts, including their PDF file, but when I publish this - everything BUT the Custom Field is displayed.

I went into the "single.php" file of twenty eleven 1.2 and added this piece of code:

[php]
<p><?php $customfield = get_post_custom_values("file_attachment");
if (isset($customField[0])) {
echo '<h3><a href="'.$customField[0].'" rel="nofollow">Download Now!</a></h3>';
} ?></p>

Nothing (in the Custom Fields) displays... What am I missing?

Thanks David! That at least makes it display the custom field value (which is currently just a text-string, but I needed to convert to an URL).

I did some additional tweaks, but nothing fancy and it seemed to work with this:

<h3><a href=<?php echo get_post_meta($post->ID, 'file_attachment', true); ?>>Download</a></h3>