When adding images or media to WordPress, if it invoes a upload to the hosting server, then we need to setup the file size allowance (something like that) in Nginx. Otherwise you may face a 413 Request Entity Too Large error message.

The step is very simple, the file you need to change is Nginx’s configuration file. Normally located at /etc/nginx/nginx.conf.

You will need to add following line to the file, INSIDE http or server or location context, like:


http {
...
# set client body size to 100M #
client_max_body_size 100M;
}


Then reload the nginx:
sudo service nginx reload

Then you should be able to upload file to the server up to 100M (which in this case) without no problem.