Index: modules/trac/files/site.conf
===================================================================
--- a/modules/trac/files/site.conf
+++ b/modules/trac/files/site.conf
@@ -4,7 +4,7 @@
   fastcgi_split_path_info ^()(.*)$;
   include /etc/nginx/fastcgi_params;
   fastcgi_param PATH_INFO $fastcgi_path_info;
-  client_max_body_size 15m;
+  client_max_body_size 20m;
 }
 
 location /chrome/
Index: modules/trac/templates/trac.ini.erb
===================================================================
--- a/modules/trac/templates/trac.ini.erb
+++ b/modules/trac/templates/trac.ini.erb
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 [attachment]
-max_size = 10262144
+max_size = 15728640
 max_zip_size = 12097152
 render_unsafe_content = false
 
@@ -44,7 +44,7 @@
 stats_provider = DefaultTicketGroupStatsProvider
 
 [mimeviewer]
-max_preview_size = 262144
+max_preview_size = 15728640
 mime_map = text/x-dylan:dylan, text/x-idl:ice, text/x-ada:ads:adb
 mime_map_patterns = text/plain:README|INSTALL|COPYING.*
 tab_width = 8