diff --git a/api/controllers/console/files.py b/api/controllers/console/files.py
index 109a3cd0d3..afaeeab192 100644
--- a/api/controllers/console/files.py
+++ b/api/controllers/console/files.py
@@ -105,7 +105,8 @@ class FilePreviewApi(Resource):
     @account_initialization_required
     def get(self, file_id):
         file_id = str(file_id)
-        text = FileService(db.engine).get_file_preview(file_id)
+        _, tenant_id = current_account_with_tenant()
+        text = FileService(db.engine).get_file_preview(file_id, tenant_id)
         return {"content": text}
 
 
diff --git a/api/services/file_service.py b/api/services/file_service.py
index b683a2f3d4..cd412638e0 100644
--- a/api/services/file_service.py
+++ b/api/services/file_service.py
@@ -172,12 +172,14 @@ class FileService:
 
         return upload_file
 
-    def get_file_preview(self, file_id: str):
+    def get_file_preview(self, file_id: str, tenant_id: str):
         """
         Return a short text preview extracted from a document file.
         """
         with self._session_maker(expire_on_commit=False) as session:
-            upload_file = session.scalar(select(UploadFile).where(UploadFile.id == file_id).limit(1))
+            upload_file = session.scalar(
+                select(UploadFile).where(UploadFile.id == file_id, UploadFile.tenant_id == tenant_id).limit(1)
+            )
 
         if not upload_file:
             raise NotFound("File not found")
diff --git a/api/tests/test_containers_integration_tests/services/test_file_service.py b/api/tests/test_containers_integration_tests/services/test_file_service.py
index 42dbdef1c9..4532005836 100644
--- a/api/tests/test_containers_integration_tests/services/test_file_service.py
+++ b/api/tests/test_containers_integration_tests/services/test_file_service.py
@@ -514,7 +514,7 @@ class TestFileService:
 
         db_session_with_containers.commit()
 
-        result = FileService(engine).get_file_preview(file_id=upload_file.id)
+        result = FileService(engine).get_file_preview(file_id=upload_file.id, tenant_id=upload_file.tenant_id)
 
         assert result == "extracted text content"
         mock_external_service_dependencies["extract_processor"].load_from_upload_file.assert_called_once()
@@ -529,7 +529,7 @@ class TestFileService:
         non_existent_id = str(fake.uuid4())
 
         with pytest.raises(NotFound, match="File not found"):
-            FileService(engine).get_file_preview(file_id=non_existent_id)
+            FileService(engine).get_file_preview(file_id=non_existent_id, tenant_id=str(fake.uuid4()))
 
     def test_get_file_preview_unsupported_file_type(
         self, db_session_with_containers: Session, engine, mock_external_service_dependencies
@@ -549,7 +549,7 @@ class TestFileService:
         db_session_with_containers.commit()
 
         with pytest.raises(UnsupportedFileTypeError):
-            FileService(engine).get_file_preview(file_id=upload_file.id)
+            FileService(engine).get_file_preview(file_id=upload_file.id, tenant_id=upload_file.tenant_id)
 
     def test_get_file_preview_text_truncation(
         self, db_session_with_containers: Session, engine, mock_external_service_dependencies
@@ -572,7 +572,7 @@ class TestFileService:
         long_text = "x" * 5000  # Longer than PREVIEW_WORDS_LIMIT
         mock_external_service_dependencies["extract_processor"].load_from_upload_file.return_value = long_text
 
-        result = FileService(engine).get_file_preview(file_id=upload_file.id)
+        result = FileService(engine).get_file_preview(file_id=upload_file.id, tenant_id=upload_file.tenant_id)
 
         assert len(result) == 3000  # PREVIEW_WORDS_LIMIT
         assert result == "x" * 3000
diff --git a/api/tests/unit_tests/controllers/console/test_files.py b/api/tests/unit_tests/controllers/console/test_files.py
index eebc6f9d60..acae081b98 100644
--- a/api/tests/unit_tests/controllers/console/test_files.py
+++ b/api/tests/unit_tests/controllers/console/test_files.py
@@ -278,7 +278,7 @@ class TestFileApiPost:
 
 
 class TestFilePreviewApi:
-    def test_get_preview(self, app, mock_file_service):
+    def test_get_preview(self, app, mock_account_context, mock_file_service):
         api = FilePreviewApi()
         get_method = unwrap(api.get)
         mock_file_service.get_file_preview.return_value = "preview text"
diff --git a/api/tests/unit_tests/services/test_file_service.py b/api/tests/unit_tests/services/test_file_service.py
index 8e1b22886b..69bd194a68 100644
--- a/api/tests/unit_tests/services/test_file_service.py
+++ b/api/tests/unit_tests/services/test_file_service.py
@@ -221,7 +221,7 @@ class TestFileService:
             mock_extract.return_value = "Extracted text content"
 
             # Execute
-            result = file_service.get_file_preview("file_id")
+            result = file_service.get_file_preview("file_id", "tenant_id")
 
             # Assert
             assert result == "Extracted text content"
@@ -229,7 +229,7 @@ class TestFileService:
     def test_get_file_preview_not_found(self, file_service, mock_db_session):
         mock_db_session.scalar.return_value = None
         with pytest.raises(NotFound, match="File not found"):
-            file_service.get_file_preview("non_existent")
+            file_service.get_file_preview("non_existent", "tenant_id")
 
     def test_get_file_preview_unsupported_type(self, file_service, mock_db_session):
         upload_file = MagicMock(spec=UploadFile)
@@ -237,7 +237,7 @@ class TestFileService:
         upload_file.extension = "exe"
         mock_db_session.scalar.return_value = upload_file
         with pytest.raises(UnsupportedFileTypeError):
-            file_service.get_file_preview("file_id")
+            file_service.get_file_preview("file_id", "tenant_id")
 
     def test_get_image_preview_success(self, file_service, mock_db_session):
         # Setup