To locate your global php.ini file
sudo vi /etc/location of php.ini
Once you have located your global php.ini file, using your favorite editor
sudo vi /etc/location of php.ini
Locate and update the following lines within the global php.ini file
post_max_size = 128M
upload_max_filesize = 128M
After you have updated your php.ini file, you should restart php. In my example, I restarted the service php-fpm.
In your Nginx vhost file add the following into your server block
/etc/nginx/sites-available/yoursite.com client_max_body_size 128m;Restart nginx safely
nginx -s reload