diff --git a/extensions/proxy/pkg/config/defaults/defaultconfig.go b/extensions/proxy/pkg/config/defaults/defaultconfig.go
index ec1bd9af8e..d43dda36fb 100644
--- a/extensions/proxy/pkg/config/defaults/defaultconfig.go
+++ b/extensions/proxy/pkg/config/defaults/defaultconfig.go
@@ -106,6 +106,16 @@ func DefaultPolicies() []config.Policy {
 					Endpoint: "/remote.php/dav/",
 					Backend:  "http://localhost:9115", // TODO use registry?
 				},
+				{
+					Type:     config.QueryRoute,
+					Endpoint: "/dav/?preview=1",
+					Backend:  "http://localhost:9115",
+				},
+				{
+					Type:     config.QueryRoute,
+					Endpoint: "/webdav/?preview=1",
+					Backend:  "http://localhost:9115",
+				},
 				{
 					Endpoint: "/remote.php/",
 					Service:  "ocdav",