/resources/local_services_lead_conversation.proto

--- v16/resources/local_services_lead_conversation.proto    2024-04-18 17:10:06.000000000 +0000
+++ v16-1/resources/local_services_lead_conversation.proto  2024-04-18 17:10:16.000000000 +0000
@@ -105,4 +105,9 @@
 message MessageDetails {
   // Output only. Textual content of the message.
   string text = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Output only. URL to the SMS or email attachments. These URLs can be used to
+  // download the contents of the attachment by using the developer token.
+  repeated string attachment_urls = 2
+      [(google.api.field_behavior) = OUTPUT_ONLY];
 }