diff --git a/docs/env.md b/docs/env.md
index 6f106246..0827fd19 100644
--- a/docs/env.md
+++ b/docs/env.md
@@ -47,6 +47,7 @@ This document lists all configurable environment variables for the Drive applica
 | `EMAIL_URL_APP` | URL used in emails to link back to the app | `None` |
 | `EMAIL_USE_SSL` | Use SSL for SMTP connection | `False` |
 | `EMAIL_USE_TLS` | Use TLS for SMTP connection | `False` |
+| `EXTERNAL_API_AUD_ITEM_ATTRIBUTES` | Extra attributes applied to items created through the external API, keyed by the token audience of the request, e.g. `{"some_audience": {"quota_excluded": true}}` | `{}` |
 | `FEATURES_ALPHA` | Enable alpha features | `False` |
 | `FEATURES_INDEXED_SEARCH` | Enable the search of indexed files through the API | `True` |
 | `FILE_EXTENSIONS_ALLOWED` | List of file extension allowed to be uploaded | See in the settings.py file |
diff --git a/docs/resource_server.md b/docs/resource_server.md
index 90516993..5c2a3546 100644
--- a/docs/resource_server.md
+++ b/docs/resource_server.md
@@ -55,6 +55,25 @@ EXTERNAL_API = {
 
 Each endpoint has `enabled` (boolean) and `actions` (list of allowed actions). Only actions explicitly listed are accessible.
 
+## Customise created item attributes per audience
+
+Configure the `EXTERNAL_API_AUD_ITEM_ATTRIBUTES` setting to apply extra attributes to items
+created through the external API, depending on the token audience of the request (the claim
+configured by `OIDC_RS_AUDIENCE_CLAIM`). Set it via the `EXTERNAL_API_AUD_ITEM_ATTRIBUTES`
+environment variable (as JSON) or in Django settings.
+
+```python
+EXTERNAL_API_AUD_ITEM_ATTRIBUTES = {
+    "some_audience": {
+        "quota_excluded": True,
+    },
+}
+```
+
+With this configuration, every item created by a request authenticated with the
+`some_audience` audience is excluded from its creator's storage quota computation.
+Audiences without an entry keep the default item attributes.
+
 ## Request Drive
 
 In order to request drive from an external resource provider, you need to implement the basic setup of `django-lasuite` [Using the OIDC Authentication Backend to request a resource server](https://github.com/suitenumerique/django-lasuite/blob/main/documentation/how-to-use-oidc-call-to-resource-server.md)
diff --git a/src/backend/core/api/viewsets.py b/src/backend/core/api/viewsets.py
index 0f9892c9..1eefe034 100644
--- a/src/backend/core/api/viewsets.py
+++ b/src/backend/core/api/viewsets.py
@@ -664,6 +664,10 @@ class ItemViewSet(
         item.size = len(template_content)
         item.save(update_fields=["upload_state", "mimetype", "size", "updated_at"])
 
+    def get_create_extra_attributes(self):
+        """Extra model attributes applied to items created by this viewset (subclass hook)."""
+        return {}
+
     def perform_create(self, serializer):
         """Set the current user as creator and owner of the newly created object."""
         extension = serializer.validated_data.pop("extension", None)
@@ -672,6 +676,7 @@ class ItemViewSet(
             creator=self.request.user,
             link_reach=LinkReachChoices.RESTRICTED,
             **serializer.validated_data,
+            **self.get_create_extra_attributes(),
         )
         if extension:
             self._create_file_from_template(obj, extension)
@@ -1121,6 +1126,7 @@ class ItemViewSet(
                 creator=request.user,
                 parent=item,
                 **serializer.validated_data,
+                **self.get_create_extra_attributes(),
             )
 
             if extension:
diff --git a/src/backend/core/external_api/viewsets.py b/src/backend/core/external_api/viewsets.py
index 7c7c6459..4fd6897f 100644
--- a/src/backend/core/external_api/viewsets.py
+++ b/src/backend/core/external_api/viewsets.py
@@ -45,6 +45,11 @@ class ResourceServerItemViewSet(ResourceServerRestrictionMixin, ItemViewSet):
         """Build resource_server_actions from settings."""
         return self._get_resource_server_actions("items")
 
+    def get_create_extra_attributes(self):
+        """Apply per-audience item attributes from EXTERNAL_API_AUD_ITEM_ATTRIBUTES."""
+        audience = getattr(self.request, "resource_server_token_audience", None)
+        return dict(settings.EXTERNAL_API_AUD_ITEM_ATTRIBUTES.get(audience) or {})
+
 
 class ResourceServerUserViewSet(ResourceServerRestrictionMixin, UserViewSet):
     """Resource Server Viewset for the Drive app."""
diff --git a/src/backend/core/tests/external_api/items/test_external_api_items.py b/src/backend/core/tests/external_api/items/test_external_api_items.py
index 5fbba56f..25c8c7ef 100644
--- a/src/backend/core/tests/external_api/items/test_external_api_items.py
+++ b/src/backend/core/tests/external_api/items/test_external_api_items.py
@@ -194,6 +194,100 @@ def test_api_items_upload_root_resource_server_using_access_token(
     assert response.status_code == 200
 
 
+@override_settings(
+    EXTERNAL_API_AUD_ITEM_ATTRIBUTES={"some_service_provider": {"quota_excluded": True}}
+)
+def test_api_items_create_root_resource_server_applies_aud_attributes(
+    user_token, resource_server_backend, user_specific_sub
+):
+    """Items created at the root should get the attributes configured for the token audience."""
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {user_token}")
+
+    response = client.post(
+        "/external_api/v1.0/items/",
+        {
+            "type": models.ItemTypeChoices.FILE,
+            "filename": "file.txt",
+        },
+    )
+
+    assert response.status_code == 201
+    child = models.Item.objects.get(id=response.json()["id"])
+    assert child.quota_excluded is True
+
+
+@override_settings(
+    EXTERNAL_API_AUD_ITEM_ATTRIBUTES={"some_service_provider": {"quota_excluded": True}}
+)
+def test_api_items_create_children_resource_server_applies_aud_attributes(
+    user_token, resource_server_backend, user_specific_sub
+):
+    """Items created as children should get the attributes configured for the token audience."""
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {user_token}")
+    item = factories.ItemFactory(
+        link_reach=models.LinkReachChoices.RESTRICTED,
+        type=models.ItemTypeChoices.FOLDER,
+    )
+    factories.UserItemAccessFactory(
+        item=item, user=user_specific_sub, role=models.RoleChoices.OWNER
+    )
+
+    response = client.post(
+        f"/external_api/v1.0/items/{item.id!s}/children/",
+        {
+            "type": models.ItemTypeChoices.FILE,
+            "filename": "file.txt",
+        },
+    )
+
+    assert response.status_code == 201
+    child = models.Item.objects.get(id=response.json()["id"])
+    assert child.quota_excluded is True
+
+
+@override_settings(EXTERNAL_API_AUD_ITEM_ATTRIBUTES={"other_audience": {"quota_excluded": True}})
+def test_api_items_create_resource_server_aud_not_configured(
+    user_token, resource_server_backend, user_specific_sub
+):
+    """Items created with an audience missing from the setting should keep default attributes."""
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {user_token}")
+
+    response = client.post(
+        "/external_api/v1.0/items/",
+        {
+            "type": models.ItemTypeChoices.FILE,
+            "filename": "file.txt",
+        },
+    )
+
+    assert response.status_code == 201
+    child = models.Item.objects.get(id=response.json()["id"])
+    assert child.quota_excluded is False
+
+
+def test_api_items_create_resource_server_no_aud_attributes_setting(
+    user_token, resource_server_backend, user_specific_sub
+):
+    """Items created with the default empty setting should keep default attributes."""
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {user_token}")
+
+    response = client.post(
+        "/external_api/v1.0/items/",
+        {
+            "type": models.ItemTypeChoices.FILE,
+            "filename": "file.txt",
+        },
+    )
+
+    assert response.status_code == 201
+    child = models.Item.objects.get(id=response.json()["id"])
+    assert child.quota_excluded is False
+
+
 # Non allowed actions on resource server.
 
 
diff --git a/src/backend/core/tests/items/test_api_items_create.py b/src/backend/core/tests/items/test_api_items_create.py
index 5756aae8..436d9eb9 100644
--- a/src/backend/core/tests/items/test_api_items_create.py
+++ b/src/backend/core/tests/items/test_api_items_create.py
@@ -59,6 +59,29 @@ def test_api_items_create_authenticated_success():
     assert item.type == ItemTypeChoices.FOLDER
 
 
+@override_settings(
+    EXTERNAL_API_AUD_ITEM_ATTRIBUTES={"some_service_provider": {"quota_excluded": True}}
+)
+def test_api_items_create_authenticated_ignores_aud_item_attributes():
+    """Per-audience attributes only apply to the external API, never to the regular API."""
+    user = factories.UserFactory()
+
+    client = APIClient()
+    client.force_login(user)
+
+    response = client.post(
+        "/api/v1.0/items/",
+        {
+            "title": "my item",
+            "type": ItemTypeChoices.FOLDER,
+        },
+        format="json",
+    )
+    assert response.status_code == 201
+    item = Item.objects.get()
+    assert item.quota_excluded is False
+
+
 def test_api_items_create_file_authenticated_no_filename():
     """
     Creating a file item without providing a filename should fail.
diff --git a/src/backend/drive/settings.py b/src/backend/drive/settings.py
index c12d1c45..57c6c39c 100755
--- a/src/backend/drive/settings.py
+++ b/src/backend/drive/settings.py
@@ -1296,6 +1296,15 @@ class Base(Configuration):
         environ_prefix=None,
     )
 
+    # Extra attributes applied to items created through the external API,
+    # keyed by the token audience of the request,
+    # e.g. {"some_audience": {"quota_excluded": True}}
+    EXTERNAL_API_AUD_ITEM_ATTRIBUTES = values.DictValue(
+        default={},
+        environ_name="EXTERNAL_API_AUD_ITEM_ATTRIBUTES",
+        environ_prefix=None,
+    )
+
     OIDC_RS_PRIVATE_KEY_STR = values.Value(
         default=None,
         environ_name="OIDC_RS_PRIVATE_KEY_STR",