When I try to upload a file to my site, I\'m getting the Nginx \"413 Request Entity Too Large\" error, however in my nginx.conf file I\'ve already explicitly stated the max size
I also add that you could define it in the *.php location handler
location ~ ^/([a-z,0-9]+)\.php$ {
Being the "lower" one in the cascading level, it would be an easy way to see if the problem comes from your nginx config or modules.
It sure doesn't come from PHP because the 413 error "body too large" is really a NGinx error.