/common/ad_asset.proto 

--- v18/common/ad_asset.proto   2025-08-05 14:36:11.000000000 +0000
+++ v19/common/ad_asset.proto   2025-08-05 14:36:14.000000000 +0000
@@ -112,3 +112,9 @@
   // The Asset resource name of this call to action asset.
   optional string asset = 1;
 }
+
+// An app deep link used inside an ad.
+message AdAppDeepLinkAsset {
+  // The Asset resource name of this app deep link asset.
+  optional string asset = 1;
+}