/resources/asset.proto 

--- v22/resources/asset.proto   2026-01-23 15:36:22.000000000 +0000
+++ v23/resources/asset.proto   2026-01-23 15:36:31.000000000 +0000
@@ -97,6 +98,11 @@
   repeated AssetFieldTypePolicySummary field_type_policy_summaries = 40
       [(google.api.field_behavior) = OUTPUT_ONLY];

+  // Output only. Orientation of the asset. This is only supported for image and
+  // video assets.
+  optional google.ads.googleads.v23.enums.AssetOrientationEnum.AssetOrientation
+      orientation = 54 [(google.api.field_behavior) = OUTPUT_ONLY];
+
   // The specific type of the asset.
   oneof asset_data {
     // Immutable. A YouTube video asset.