Nginx Multisite doesn't show uploaded images

I have Nginx set up as a reverse proxy on my VPS. I also have a WordPress multisite installation set up. Everything works just fine except for the uploaded images. I can create new sites and I can upload images to those site but the images don’t display in the backend or on the frontend.

Here is the site config for Nginx:

map $http_host $blogid {
        default	  -999;
        include /home/cpress/public_html/wp-content/plugins/nginx-helper/map.conf;
    }

    server {
              error_log /var/log/nginx/vhost-error_log warn;
              listen server.ip.address:80;
              server_name site.com www.site.com *.site.com;
              access_log /usr/local/apache/domlogs/site.com-bytes_log bytes_log;
              access_log /usr/local/apache/domlogs/site.com combined;
              root /home/cpress/public_html;
              index index.php index.html index.htm;

              location / {
              location ~.*\.(3gp|gif|jpg|jpeg|png|ico|wmv|avi|asf|asx|mpg|mpeg|mp4|pls|mp3|mid|wav|swf|flv|html|htm|txt|js|css|exe|zip|tar|rar|gz|tgz|bz2|uha|7z|doc|docx|xls|xlsx|pdf|iso)$ {
              expires 30d;
              try_files $uri  $uri/ /index.php?$args;
              }

              rewrite /wp-admin$ $scheme://$host$uri/ permanent;

              error_page 405 = @backend;
              add_header X-Cache "HIT from Backend";
              proxy_pass https://server.ip.address:8081;
              include proxy.inc;
              }
              location @backend {
              internal;
              proxy_pass https://server.ip.address:8081;
              include proxy.inc;
              }
              location ~ .*\.(php|jsp|cgi|pl|py)?$ {
              proxy_pass https://server.ip.address:8081;
              include proxy.inc;
              }
              location ~ /\.ht {
              deny all;
              }

    location ~ \.php$ {
              try_files $uri @wordpress;
              proxy_set_header Host $host;
              proxy_set_header X-Real-IP $remote_addr;
              proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
              proxy_pass   https://server.ip.address:8081;
              }

    location ~ ^/files/(.*)$ {
              try_files /wp-content/blogs.dir/$blogid/$uri /wp-includes/ms-files.php?file=$1;
              access_log off; log_not_found off; expires max;
              }

    location ^~ /blogs.dir {
              internal;
              alias /home/cpress/public_html/wp-content/blogs.dir;
              access_log off; log_not_found off; expires max;
              }
    }