Sounds like rewrite is missing. It's supereasy, go to...

/etc/nginx/sites-available/yourdomain.conf

There are two options, depending your setup.... 

Add this...

# UNA Rewrite
    location / {
    index index.html index.htm index.php;
    rewrite "^/page/(.*)$" /page.php?i=$1 last;
    rewrite "^/m/(.*)$" /modules/index.php?r=$1 last;
    rewrite "^/s/([a-zA-Z0-9_]+)/([a-zA-Z0-9\.]+)" /storage.php?o=$1&f=$2 last;
     }

If ... yourdomain.com/una/, or something like that then you need this... (if not una, you can rename to  match yours)

# UNA Rewrite
    location /una/ {
    index index.html index.htm index.php;
    rewrite "^/una/page/(.*)$" /una/page.php?i=$1 last;
    rewrite "^/una/m/(.*)$" /una/modules/index.php?r=$1 last;
    rewrite "^/una/s/([a-zA-Z0-9_]+)/([a-zA-Z0-9\.]+)" /una/storage.php?o=$1&f=$2 last;
     }

Then restart nginx and you're good to go!