diff --git a/test/llm_span/bedrock/attachments.yaml b/test/llm_span/bedrock/attachments.yaml
index 4b9ba45..c50611b 100644
--- a/test/llm_span/bedrock/attachments.yaml
+++ b/test/llm_span/bedrock/attachments.yaml
@@ -33,7 +33,11 @@ expected_brainstore_spans:
             image:
               format: png
               source:
-                bytes: !fn is_non_empty_string
+                bytes:
+                  type: braintrust_attachment
+                  content_type: image/png
+                  filename: !fn is_non_empty_string
+                  key: !fn is_non_empty_string
     output:
       - role: assistant
         content: