diff --git a/cognite/pygen/_core/templates/_api_client_multi_model.py.jinja b/cognite/pygen/_core/templates/_api_client_multi_model.py.jinja
index 0aba0da61..574b1f7c4 100644
--- a/cognite/pygen/_core/templates/_api_client_multi_model.py.jinja
+++ b/cognite/pygen/_core/templates/_api_client_multi_model.py.jinja
@@ -5,7 +5,7 @@ from pathlib import Path
 from typing import Any, Sequence
 
 from cognite.client import ClientConfig, CogniteClient, data_modeling as dm
-from cognite.client.data_classes import TimeSeriesList
+from cognite.client.data_classes import TimeSeriesList, FileMetadataList, SequenceList
 from cognite.client.credentials import OAuthClientCredentials
 
 from ._api import ({% for api in api_classes %}{% if not api.data_class.is_edge_class %}
@@ -79,6 +79,8 @@ class {{ client_name }}:
     ) -> data_classes.ResourcesWriteResult:
         """Add or update (upsert) items.
 
+        This method will create the nodes, edges, timeseries, files and sequences of the supplied items.
+
         Args:
             items: One or more instances of the pygen generated data classes.
             replace (bool): How do we behave when a property value exists? Do we replace all matching and existing values with the supplied values (true)?
@@ -103,8 +105,17 @@ class {{ client_name }}:
         time_series = TimeSeriesList([])
         if instances.time_series:
             time_series = self._client.time_series.upsert(instances.time_series, mode="patch")
+        files = FileMetadataList([])
+        if instances.files:
+            for file in instances.files:
+                created, _ = self._client.files.create(file, overwrite=True)
+                files.append(created)
+
+        sequences = SequenceList([])
+        if instances.sequences:
+            sequences = self._client.sequences.upsert(instances.sequences, mode="patch")
 
-        return data_classes.ResourcesWriteResult(result.nodes, result.edges, TimeSeriesList(time_series))
+        return data_classes.ResourcesWriteResult(result.nodes, result.edges, time_series, files, sequences)
 
     def _create_instances(
         self,
@@ -133,7 +144,7 @@ class {{ client_name }}:
         replace: bool = False,
         write_none: bool = False,
     ) -> data_classes.ResourcesWriteResult:
-        """Add or update (upsert) items.
+        """[DEPRECATED] Add or update (upsert) items.
 
         Args:
             items: One or more instances of the pygen generated data classes.
diff --git a/cognite/pygen/_core/templates/_api_client_single_model.py.jinja b/cognite/pygen/_core/templates/_api_client_single_model.py.jinja
index deff6945e..d10e0332b 100644
--- a/cognite/pygen/_core/templates/_api_client_single_model.py.jinja
+++ b/cognite/pygen/_core/templates/_api_client_single_model.py.jinja
@@ -5,7 +5,7 @@ from pathlib import Path
 from typing import Any, Sequence
 
 from cognite.client import ClientConfig, CogniteClient, data_modeling as dm
-from cognite.client.data_classes import TimeSeriesList
+from cognite.client.data_classes import TimeSeriesList, FileMetadataList, SequenceList
 from cognite.client.credentials import OAuthClientCredentials
 
 from ._api import ({% for api in api_classes %}{% if not api.data_class.is_edge_class %}
@@ -54,6 +54,8 @@ class {{ client_name }}:
     ) -> data_classes.ResourcesWriteResult:
         """Add or update (upsert) items.
 
+        This method will create the nodes, edges, timeseries, files and sequences of the supplied items.
+
         Args:
             items: One or more instances of the pygen generated data classes.
             replace (bool): How do we behave when a property value exists? Do we replace all matching and existing values with the supplied values (true)?
@@ -78,8 +80,17 @@ class {{ client_name }}:
         time_series = TimeSeriesList([])
         if instances.time_series:
             time_series = self._client.time_series.upsert(instances.time_series, mode="patch")
+        files = FileMetadataList([])
+        if instances.files:
+            for file in instances.files:
+                created, _ = self._client.files.create(file, overwrite=True)
+                files.append(created)
+
+        sequences = SequenceList([])
+        if instances.sequences:
+            sequences = self._client.sequences.upsert(instances.sequences, mode="patch")
 
-        return data_classes.ResourcesWriteResult(result.nodes, result.edges, TimeSeriesList(time_series))
+        return data_classes.ResourcesWriteResult(result.nodes, result.edges, time_series, files, sequences)
 
     def _create_instances(
         self,
@@ -108,7 +119,7 @@ class {{ client_name }}:
         replace: bool = False,
         write_none: bool = False,
     ) -> data_classes.ResourcesWriteResult:
-        """Add or update (upsert) items.
+        """[DEPRECATED] Add or update (upsert) items.
 
         Args:
             items: One or more instances of the pygen generated data classes.
diff --git a/examples/omni/_api_client.py b/examples/omni/_api_client.py
index 966f3e66c..0bcf11e90 100644
--- a/examples/omni/_api_client.py
+++ b/examples/omni/_api_client.py
@@ -7,7 +7,6 @@
 from cognite.client import ClientConfig, CogniteClient, data_modeling as dm
 from cognite.client.data_classes import TimeSeriesList, FileMetadataList, SequenceList
 from cognite.client.credentials import OAuthClientCredentials
-from cognite.client.exceptions import CogniteAPIError
 
 from ._api import (
     CDFExternalReferencesAPI,