The error “413 – Request Entity Too Large” indicates that web server configured to restrict large file size. Nginx can be set to allow the maximum size of the client request body using client_max_body_size directive. If the size of a request exceeds the configured value, the 413 (Request Entity Too Large) error returned to the client.
sudo nano /etc/nginx/nginx.conf
Add the following line to http or server or location context to increase the size limit in nginx.conf, enter:
# set client body size to 2M #
client_max_body_size 2M
Reload nginx with this
/sbin/nginx -s reload