diff --git a/connections/implementation/proto/offline_wire_formats.proto b/connections/implementation/proto/offline_wire_formats.proto
index d4e2fed091..1d7a641a21 100644
--- a/connections/implementation/proto/offline_wire_formats.proto
+++ b/connections/implementation/proto/offline_wire_formats.proto
@@ -179,6 +179,7 @@ message PayloadTransferFrame {
     optional bool is_sensitive = 4;
     optional string file_name = 5;
     optional string parent_folder = 6;
+    optional int64 last_modified_timestamp_millis = 7;
   }
 
   // Accompanies DATA packets.