If using nginx, there is a parameter in the vhost that needs to be set (not sure about Apache) that will control the size of the uploads. I believe it is the client_max_body_size.
That setting is not a php.ini setting. It is specific to the HTTP server used (in this case nginx).
The equivalent for Apache is LimitRequestBody and is in the Apache configuration (typically) for the vhost,unless it is being set globally.