File Size to Large

if file size is to small
This might just be the place you're looking for. By default NGINX comes with a rather small upload limit for mainly security and disk usage reasons. However, this is a simple to change issue for all. Follow the below steps for a quick fix on this issue.

Open The Config File

By default there will be an NGINX config file located at

/etc/nginx/nginx.conf
Open this file via SMTP or the nano command

Applying The Fix

Now this file is structured in a particular way. So we can't go around placing this anywhere.

In the HTTP block (after http {) we want to place our line.

client_max_body_size 1000M; # This will increase the limit to 1GB. Measured in MB.
Keep note that setting it to 0 disables checking of client request body size.

(client_max_body_size 0; # Disables checking client body size)