Which Zimbra configuration file controls the request body size limit?

The request body size limit in Zimbra is primarily controlled by the web server's configuration. For Apache, this is often `LimitRequestBody` in `httpd.conf` or within virtual host configurations. For Nginx, it's `client_max_body_size` in `nginx.conf` or site-specific configurations. PHP's `post_max_size` also plays a role in handling POST data, which includes file uploads.