diff --git a/greenlight.nginx b/greenlight.nginx
index fb0b90f0..d6b26e9a 100644
--- a/greenlight.nginx
+++ b/greenlight.nginx
@@ -25,9 +25,20 @@ location /b/cable {
   send_timeout        6h;
 }
 
+# Allow larger body size for uploading presentations
+location ~ /preupload_presentation$ {
+  client_max_body_size 30m;
+
+  proxy_pass          http://127.0.0.1:5000;
+  proxy_set_header    Host              $host;
+  proxy_set_header    X-Forwarded-For   $proxy_add_x_forwarded_for;
+  proxy_set_header    X-Forwarded-Proto $scheme;
+  proxy_http_version  1.1;
+}
+
 # Only needed if using presentations and deployed at a relative root (ex "/b")
 # If deploying at "/", delete the section below
 
 location /rails/active_storage {
   return 301 /b$request_uri;
-}
\ No newline at end of file
+}