We needed to up the “Maximum upload file size” limit on a client’s WordPress site hosted on WPENGINE. It starts at 50mb by default but we had media (audio) files that were often a bit more than that. We decided to raise the limit to 75 MB.
This can be accomplished by adding this to the .htaccess file in the root of your WPENGINE site.
php_value upload_max_filesize 75M
php_value post_max_size 75M
php_value max_execution_time 300
php_value max_input_time 300
However, you should jump on chat with WPENGINE and have them add it to the Nginx configuration file as well to make sure you get the new max file upload rule all the way through.