diff --git a/src/sentry/options/defaults.py b/src/sentry/options/defaults.py
index 9565e3f257b7..69bf36856d33 100644
--- a/src/sentry/options/defaults.py
+++ b/src/sentry/options/defaults.py
@@ -4434,3 +4434,10 @@
     default=False,
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
+
+register(
+    "preprod.snapshots.objectstore.snapshots-usecase.enabled",
+    type=Bool,
+    default=False,
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
diff --git a/src/sentry/preprod/api/endpoints/project_preprod_upload_options.py b/src/sentry/preprod/api/endpoints/project_preprod_upload_options.py
index 2999f75a246d..2fc7174c79ee 100644
--- a/src/sentry/preprod/api/endpoints/project_preprod_upload_options.py
+++ b/src/sentry/preprod/api/endpoints/project_preprod_upload_options.py
@@ -16,6 +16,7 @@
 from sentry.models.project import Project
 from sentry.objectstore import UsecaseId, get_session
 from sentry.objectstore.types import ObjectstoreUploadOptions
+from sentry.preprod.snapshots.storage import get_snapshot_usecase
 from sentry.utils.http import absolute_uri
 
 
@@ -28,9 +29,13 @@ class ProjectPreprodUploadOptionsEndpoint(ProjectEndpoint):
     permission_classes = (ProjectReleasePermission,)
 
     def get(self, request: Request, project: Project) -> Response:
-        if request.GET.get("usecase") not in (None, "auto"):
+        requested = request.GET.get("usecase")
+        if requested is None:
+            usecase = UsecaseId.PREPROD
+        elif requested == "auto":
+            usecase = get_snapshot_usecase()
+        else:
             return Response({"detail": "Invalid usecase"}, status=400)
-        usecase = UsecaseId.PREPROD
 
         organization = project.organization
         session = get_session(usecase, project)
diff --git a/src/sentry/preprod/snapshots/storage.py b/src/sentry/preprod/snapshots/storage.py
index 1a2473bb4cbf..1b8f1c48b01e 100644
--- a/src/sentry/preprod/snapshots/storage.py
+++ b/src/sentry/preprod/snapshots/storage.py
@@ -6,11 +6,18 @@
 from objectstore_client.multipart import MultipartUpload
 from urllib3.exceptions import HTTPError
 
+from sentry import options
 from sentry.models.project import Project
 from sentry.objectstore import UsecaseId, get_session
 from sentry.utils import metrics
 
 
+def get_snapshot_usecase() -> UsecaseId:
+    if options.get("preprod.snapshots.objectstore.snapshots-usecase.enabled"):
+        return UsecaseId.PREPROD_SNAPSHOTS
+    return UsecaseId.PREPROD
+
+
 # TODO: On January 1, 2027, remove the preprod fallback and use preprod_snapshots exclusively.
 class SnapshotStorage:
     def __init__(self, primary: Session, fallback: Session) -> None:
@@ -62,7 +69,13 @@ def delete(self, key: str) -> None:
 
 
 def get_snapshot_storage(project: Project | int, *, org: int | None = None) -> SnapshotStorage:
+    primary_usecase = get_snapshot_usecase()
+    if primary_usecase == UsecaseId.PREPROD:
+        fallback_usecase = UsecaseId.PREPROD_SNAPSHOTS
+    else:
+        fallback_usecase = UsecaseId.PREPROD
+
     return SnapshotStorage(
-        primary=get_session(UsecaseId.PREPROD, project, org=org),
-        fallback=get_session(UsecaseId.PREPROD_SNAPSHOTS, project, org=org),
+        primary=get_session(primary_usecase, project, org=org),
+        fallback=get_session(fallback_usecase, project, org=org),
     )
diff --git a/tests/sentry/preprod/api/endpoints/test_project_preprod_upload_options.py b/tests/sentry/preprod/api/endpoints/test_project_preprod_upload_options.py
index f09e31e46495..ef26d2f6c4fc 100644
--- a/tests/sentry/preprod/api/endpoints/test_project_preprod_upload_options.py
+++ b/tests/sentry/preprod/api/endpoints/test_project_preprod_upload_options.py
@@ -7,6 +7,7 @@
 
 from sentry.objectstore import UsecaseId
 from sentry.testutils.cases import APITestCase
+from sentry.testutils.helpers.options import override_options
 
 
 class ProjectPreprodUploadOptionsTest(APITestCase):
@@ -55,6 +56,32 @@ def test_auto_returns_preprod(self, mock_get_session) -> None:
         assert response.data["objectstore"]["usecase"] == "preprod"
         mock_get_session.assert_called_once_with(UsecaseId.PREPROD, self.project)
 
+    @patch("sentry.preprod.api.endpoints.project_preprod_upload_options.get_session")
+    def test_auto_follows_option(self, mock_get_session) -> None:
+        mock_session = MagicMock()
+        mock_session.mint_token.return_value = "fake-token"
+        mock_get_session.return_value = mock_session
+
+        with override_options({"preprod.snapshots.objectstore.snapshots-usecase.enabled": True}):
+            response = self.client.get(self.url, {"usecase": "auto"})
+
+        assert response.status_code == 200
+        assert response.data["objectstore"]["usecase"] == "preprod_snapshots"
+        mock_get_session.assert_called_once_with(UsecaseId.PREPROD_SNAPSHOTS, self.project)
+
+    @patch("sentry.preprod.api.endpoints.project_preprod_upload_options.get_session")
+    def test_omitted_param_stays_preprod_after_flip(self, mock_get_session) -> None:
+        mock_session = MagicMock()
+        mock_session.mint_token.return_value = "fake-token"
+        mock_get_session.return_value = mock_session
+
+        with override_options({"preprod.snapshots.objectstore.snapshots-usecase.enabled": True}):
+            response = self.client.get(self.url)
+
+        assert response.status_code == 200
+        assert response.data["objectstore"]["usecase"] == "preprod"
+        mock_get_session.assert_called_once_with(UsecaseId.PREPROD, self.project)
+
     def test_rejects_explicit_usecase(self) -> None:
         response = self.client.get(self.url, {"usecase": "preprod_snapshots"})
 
diff --git a/tests/sentry/preprod/snapshots/test_storage.py b/tests/sentry/preprod/snapshots/test_storage.py
index e730e64b9670..8bb17c56260b 100644
--- a/tests/sentry/preprod/snapshots/test_storage.py
+++ b/tests/sentry/preprod/snapshots/test_storage.py
@@ -6,6 +6,8 @@
 
 from sentry.objectstore import UsecaseId
 from sentry.preprod.snapshots.storage import SnapshotStorage, get_snapshot_storage
+from sentry.testutils.helpers.options import override_options
+from sentry.testutils.pytest.fixtures import django_db_all
 
 
 @pytest.fixture
@@ -92,10 +94,22 @@ def test_fallback_records_metric(mock_metrics, sessions) -> None:
     )
 
 
+@django_db_all
 @patch("sentry.preprod.snapshots.storage.get_session")
-def test_factory_builds_all_sessions(mock_get_session) -> None:
+def test_factory_defaults_to_preprod_primary(mock_get_session) -> None:
     get_snapshot_storage(42, org=7)
     assert mock_get_session.call_args_list == [
         call(UsecaseId.PREPROD, 42, org=7),
         call(UsecaseId.PREPROD_SNAPSHOTS, 42, org=7),
     ]
+
+
+@django_db_all
+@patch("sentry.preprod.snapshots.storage.get_session")
+def test_factory_follows_option(mock_get_session) -> None:
+    with override_options({"preprod.snapshots.objectstore.snapshots-usecase.enabled": True}):
+        get_snapshot_storage(42, org=7)
+    assert mock_get_session.call_args_list == [
+        call(UsecaseId.PREPROD_SNAPSHOTS, 42, org=7),
+        call(UsecaseId.PREPROD, 42, org=7),
+    ]