Increase client_max_body_size to 100MB

config/discourse-nginx.conf

@@ -40,7 +40,7 @@ server {
   keepalive_timeout 25;
 
   # maximum file upload size (keep up to date when changing the corresponding site setting)
-  client_max_body_size 10m;
+  client_max_body_size 100m;
 
   # path to discourse's public directory
   set $public /discourse/public;