By default, You need to optimize some PHP settings in order to be  able to upload larger size files, have more connections at the same time, etc. , including:

• Increase PHP execution time (PHP param max_execution_time is 30

...

• seconds

...

• by default)
• Increase Max Upload Size 

In this tutorial, I will guide you increase this value both on nginx and apache to how to update on both Nginx and Apache server.

Nginx server

Changes in php.ini

On CentOS: php.ini is saved in: /etc/php.ini

...

(Increase php execution time to 3000 seconds)

Changes in Nginx Config

On file nginx config for your site, add this line fastcgi_read_timeout 3000; like this:

...

By Default, the path of nginx config is saved in /etc/nginx/nginx.conf (CentOS) or /etc/nginx/sites-available/default (Ubuntu)

Reload nginx and php

Run these commands:

systemctl restart nginx
 
#CentOS
systemctl restart php-fpm
 
#Ubuntu (which 7.0 is php version)
systemctl restart php7.0-fpm

Check your result

Check on phpinfo

Apache Server

Changes in php.ini

On CentOS: php.ini is saved in: /etc/php.ini

...

max_execution_time = 3000

Reload apache

Run these commands:

#CentOS
systemctl restart httpd
 
#Ubuntu
systemctl restart apache2