diff --git a/python/langsmith/client.py b/python/langsmith/client.py
index a0c98cdcd..82c25e8da 100644
--- a/python/langsmith/client.py
+++ b/python/langsmith/client.py
@@ -3833,13 +3833,13 @@ def read_example(
         )
 
         example = response.json()
-        attachment_urls = {}
+        attachments = {}
         if example["attachment_urls"]:
             for key, value in example["attachment_urls"].items():
                 response = requests.get(value["presigned_url"], stream=True)
                 response.raise_for_status()
                 reader = io.BytesIO(response.content)
-                attachment_urls[key.split(".")[1]] = {
+                attachments[key.split(".")[1]] = {
                     "presigned_url": value["presigned_url"],
                     "reader": reader,
                 }
@@ -3847,7 +3847,7 @@ def read_example(
 
         return ls_schemas.Example(
             **example,
-            attachment_urls=attachment_urls,
+            attachments=attachments,
             _host_url=self._host_url,
             _tenant_id=self._get_optional_tenant_id(),
         )
@@ -3920,13 +3920,13 @@ def list_examples(
         for i, example in enumerate(
             self._get_paginated_list("/examples", params=params)
         ):
-            attachment_urls = {}
+            attachments = {}
             if example["attachment_urls"]:
                 for key, value in example["attachment_urls"].items():
                     response = requests.get(value["presigned_url"], stream=True)
                     response.raise_for_status()
                     reader = io.BytesIO(response.content)
-                    attachment_urls[key.split(".")[1]] = {
+                    attachments[key.split(".")[1]] = {
                         "presigned_url": value["presigned_url"],
                         "reader": reader,
                     }
@@ -3934,7 +3934,7 @@ def list_examples(
 
             yield ls_schemas.Example(
                 **example,
-                attachment_urls=attachment_urls,
+                attachments=attachments,
                 _host_url=self._host_url,
                 _tenant_id=self._get_optional_tenant_id(),
             )
diff --git a/python/langsmith/evaluation/_arunner.py b/python/langsmith/evaluation/_arunner.py
index 44d502f48..415db9e07 100644
--- a/python/langsmith/evaluation/_arunner.py
+++ b/python/langsmith/evaluation/_arunner.py
@@ -1025,7 +1025,7 @@ def _get_run(r: run_trees.RunTree) -> None:
     with rh.tracing_context(enabled=True):
         try:
             args = (
-                (example.inputs, example.attachment_urls)
+                (example.inputs, example.attachments)
                 if include_attachments
                 else (example.inputs,)
             )
@@ -1046,9 +1046,9 @@ def _get_run(r: run_trees.RunTree) -> None:
                     client=client,
                 ),
             )
-            if include_attachments and example.attachment_urls is not None:
-                for attachment in example.attachment_urls:
-                    reader = example.attachment_urls[attachment]["reader"]
+            if include_attachments and example.attachments is not None:
+                for attachment in example.attachments:
+                    reader = example.attachments[attachment]["reader"]
                     reader.seek(0)
         except Exception as e:
             logger.error(
diff --git a/python/langsmith/evaluation/_runner.py b/python/langsmith/evaluation/_runner.py
index 189c62bed..ff92f0f6c 100644
--- a/python/langsmith/evaluation/_runner.py
+++ b/python/langsmith/evaluation/_runner.py
@@ -1835,7 +1835,7 @@ def _get_run(r: rt.RunTree) -> None:
         )
         try:
             args = (
-                (example.inputs, example.attachment_urls)
+                (example.inputs, example.attachments)
                 if include_attachments
                 else (example.inputs,)
             )
@@ -1843,9 +1843,9 @@ def _get_run(r: rt.RunTree) -> None:
                 *args,
                 langsmith_extra=langsmith_extra,
             )
-            if include_attachments and example.attachment_urls is not None:
-                for attachment in example.attachment_urls:
-                    reader = example.attachment_urls[attachment]["reader"]
+            if include_attachments and example.attachments is not None:
+                for attachment in example.attachments:
+                    reader = example.attachments[attachment]["reader"]
                     reader.seek(0)
         except Exception as e:
             logger.error(
diff --git a/python/langsmith/schemas.py b/python/langsmith/schemas.py
index 41fa76cb0..5b226a830 100644
--- a/python/langsmith/schemas.py
+++ b/python/langsmith/schemas.py
@@ -146,7 +146,7 @@ class Example(ExampleBase):
     modified_at: Optional[datetime] = Field(default=None)
     runs: List[Run] = Field(default_factory=list)
     source_run_id: Optional[UUID] = None
-    attachment_urls: Optional[Dict[str, AttachmentInfo]] = Field(default=None)
+    attachments: Optional[Dict[str, AttachmentInfo]] = Field(default=None)
     """Dictionary with attachment names as keys and a tuple of the S3 url
     and a reader of the data for the file."""
     _host_url: Optional[str] = PrivateAttr(default=None)
diff --git a/python/tests/integration_tests/test_client.py b/python/tests/integration_tests/test_client.py
index 8aa4f3e93..3bfaff319 100644
--- a/python/tests/integration_tests/test_client.py
+++ b/python/tests/integration_tests/test_client.py
@@ -379,6 +379,9 @@ def test_error_surfaced_invalid_uri(uri: str) -> None:
 
 def test_upload_examples_multipart(langchain_client: Client):
     """Test uploading examples with attachments via multipart endpoint."""
+    langchain_client._info = {
+        "instance_flags": {"dataset_examples_multipart_enabled": True}
+    }
     dataset_name = "__test_upload_examples_multipart" + uuid4().hex[:4]
     if langchain_client.has_dataset(dataset_name=dataset_name):
         langchain_client.delete_dataset(dataset_name=dataset_name)
@@ -436,7 +439,7 @@ def test_upload_examples_multipart(langchain_client: Client):
     # Verify example with ID was created with correct ID
     example_with_id = [ex for ex in examples if ex.id == example_id][0]
     assert example_with_id.inputs["text"] == "hello world"
-    assert "test_file" in example_with_id.attachment_urls
+    assert "test_file" in example_with_id.attachments
 
     # Verify example with outputs and multiple attachments
     example_with_outputs = next(
@@ -444,9 +447,9 @@ def test_upload_examples_multipart(langchain_client: Client):
         for ex in examples
         if ex.outputs and ex.outputs.get("response") == "test response"
     )
-    assert len(example_with_outputs.attachment_urls) == 2
-    assert "file1" in example_with_outputs.attachment_urls
-    assert "file2" in example_with_outputs.attachment_urls
+    assert len(example_with_outputs.attachments) == 2
+    assert "file1" in example_with_outputs.attachments
+    assert "file2" in example_with_outputs.attachments
 
     # Test uploading to non-existent dataset fails
     fake_id = uuid4()
@@ -1244,6 +1247,9 @@ def test_list_examples_attachments_keys(langchain_client: Client) -> None:
 
 def test_evaluate_with_attachments(langchain_client: Client) -> None:
     """Test evaluating examples with attachments."""
+    langchain_client._info = {
+        "instance_flags": {"dataset_examples_multipart_enabled": True}
+    }
     dataset_name = "__test_evaluate_attachments" + uuid4().hex[:4]
 
     # 1. Create dataset
@@ -1352,6 +1358,9 @@ def evaluator(
 
 def test_evaluate_with_no_attachments(langchain_client: Client) -> None:
     """Test evaluating examples without attachments using a target with attachments."""
+    langchain_client._info = {
+        "instance_flags": {"dataset_examples_multipart_enabled": True}
+    }
     dataset_name = "__test_evaluate_no_attachments" + uuid4().hex[:4]
     dataset = langchain_client.create_dataset(
         dataset_name,