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The Gravity Forms GAE File Upload is a simple plugin that makes use of various GravityForms and WordPress hooks to adjust form submission parameters and WordPress upload paths to make Gravity Forms file uploading work with Google App Engine and Google Cloud Storage.

GravityForms File Upload for GAE

The Gravity Forms GAE File Upload allows you to use Gravity Forms' file uploading features with Google App Engine.

Google

Sennza Pty Ltd

Google App Engine for WordPress enables seamless operation of your 
WordPress-powered site on the App Engine PHP runtime.
This plugin adds overrides to core functionality in WordPress to use App Engine 
infrastructure, such as the Mail functionality, and uploading media to Google 
Cloud Storage
<h4>Note: This plugin is designed to be used with Google App Engine only and will not work with any other hosting.</h4>
<h3>Caching</h3>
We recommend using the <a href="https://wordpress.org/plugins/batcache/" rel="ugc">Batcache</a> and <a href="https://wordpress.org/extend/plugins/memcached/" rel="ugc">Memcache</a> drop-ins to cache your 
WordPress site. Batcache integrates with Memcache to cache your site on the App 
Engine memcache server and will ensure that CloudSQL is used as little as 
possible, reducing your costs.
If you host a rarely updated site, we suggest adding the following configuration 
to your <code>wp-config.php</code>:
<pre><code>$batcache = [
 'seconds' => 0,
 'max_age' => 60 * 30, // 30 minutes.
];
</code></pre>
This will cache pages on your site for a year and ensure that they do not expire 
in memcache. With this setup and a fully primed cache, all anonymous users will 
be served via Memcache with no hits to CloudSQL.
Note that using WordPress’ built-in comments will enable commenters to bypass 
the cache, so if you want to use comments on a fully-cached site, we recommend 
<a href="https://wordpress.org/plugins/intensedebate/" rel="ugc">Intense Debate</a> or <a href="https://wordpress.org/plugins/disqus-comment-system/" rel="ugc">Disqus</a> (with the synchronization disabled).

Google App Engine for WordPress

Optimize your WordPress installation for the Google App Engine platform.

GravityForms File Upload for GAE vs Google App Engine for WordPress