diff --git a/.github/workflows/build-wheels-windows.yml b/.github/workflows/build-wheels-windows.yml
index 1d47449568..556d805c64 100644
--- a/.github/workflows/build-wheels-windows.yml
+++ b/.github/workflows/build-wheels-windows.yml
@@ -37,7 +37,7 @@ jobs:
             post-script: "python packaging/wheel/relocate.py"
             smoke-test-script: test/smoke_test.py
             package-name: torchrl
-    name: pytorch/rl
+    name: ${{ matrix.repository }}
     uses: pytorch/test-infra/.github/workflows/build_wheels_windows.yml@main
     with:
       repository: ${{ matrix.repository }}
diff --git a/.github/workflows/wheels-legacy.yml b/.github/workflows/wheels-legacy.yml
index 25a42b8043..998b9eba4b 100644
--- a/.github/workflows/wheels-legacy.yml
+++ b/.github/workflows/wheels-legacy.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        python_version: [["3.9", "3.9"], ["3.10", "3.10.3"], ["3.11", "3.11"],  ["3.12", "3.12"]]
+        python_version: [["3.9", "3.9"], ["3.10", "3.10.3"], ["3.11", "3.11"], ["3.12", "3.12"]]
     steps:
       - name: Setup Python
         uses: actions/setup-python@v2
@@ -37,12 +37,12 @@ jobs:
             python3 -mpip install wheel
             TORCHRL_BUILD_VERSION=0.5.0 python3 setup.py bdist_wheel
       - name: Upload wheel for the test-wheel job
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: torchrl-win-${{ matrix.python_version[0] }}.whl
           path: dist/torchrl-*.whl
       - name: Upload wheel for download
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: torchrl-batch.whl
           path: dist/*.whl
@@ -77,7 +77,7 @@ jobs:
         run: |
           python3 -mpip install numpy pytest pytest-cov codecov unittest-xml-reporting pillow>=4.1.1 scipy av networkx expecttest pyyaml
       - name: Download built wheels
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: torchrl-win-${{ matrix.python_version }}.whl
           path: wheels
diff --git a/test/test_rb.py b/test/test_rb.py
index af7140b398..3d8db28553 100644
--- a/test/test_rb.py
+++ b/test/test_rb.py
@@ -26,6 +26,7 @@
     assert_allclose_td,
     is_tensor_collection,
     is_tensorclass,
+    LazyStackedTensorDict,
     tensorclass,
     TensorDict,
     TensorDictBase,
@@ -715,6 +716,20 @@ def test_storage_state_dict(self, storage_in, storage_out, init_out, backend):
         s = new_replay_buffer.sample()
         assert (s.exclude("index") == 1).all()
 
+    @pytest.mark.parametrize("storage_type", [LazyMemmapStorage, LazyTensorStorage])
+    def test_extend_lazystack(self, storage_type):
+
+        rb = ReplayBuffer(
+            storage=storage_type(6),
+            batch_size=2,
+        )
+        td1 = TensorDict(a=torch.rand(5, 4, 8), batch_size=5)
+        td2 = TensorDict(a=torch.rand(5, 3, 8), batch_size=5)
+        ltd = LazyStackedTensorDict(td1, td2, stack_dim=1)
+        rb.extend(ltd)
+        rb.sample(3)
+        assert len(rb) == 5
+
     @pytest.mark.parametrize("device_data", get_default_devices())
     @pytest.mark.parametrize("storage_type", [LazyMemmapStorage, LazyTensorStorage])
     @pytest.mark.parametrize("data_type", ["tensor", "tc", "td", "pytree"])
diff --git a/torchrl/data/replay_buffers/storages.py b/torchrl/data/replay_buffers/storages.py
index 20b2169cc8..f047d5b2d2 100644
--- a/torchrl/data/replay_buffers/storages.py
+++ b/torchrl/data/replay_buffers/storages.py
@@ -5,6 +5,8 @@
 from __future__ import annotations
 
 import abc
+
+import logging
 import os
 import textwrap
 import warnings
@@ -1116,16 +1118,17 @@ def max_size_along_dim0(data_shape):
             out = data.clone().to(self.device)
             out = out.expand(max_size_along_dim0(data.shape))
             out = out.memmap_like(prefix=self.scratch_dir, existsok=self.existsok)
-            for key, tensor in sorted(
-                out.items(include_nested=True, leaves_only=True), key=str
-            ):
-                try:
-                    filesize = os.path.getsize(tensor.filename) / 1024 / 1024
-                    torchrl_logger.debug(
-                        f"\t{key}: {tensor.filename}, {filesize} Mb of storage (size: {tensor.shape})."
-                    )
-                except (AttributeError, RuntimeError):
-                    pass
+            if torchrl_logger.getEffectiveLevel() == logging.DEBUG:
+                for key, tensor in sorted(
+                    out.items(include_nested=True, leaves_only=True), key=str
+                ):
+                    try:
+                        filesize = os.path.getsize(tensor.filename) / 1024 / 1024
+                        torchrl_logger.debug(
+                            f"\t{key}: {tensor.filename}, {filesize} Mb of storage (size: {tensor.shape})."
+                        )
+                    except (AttributeError, RuntimeError):
+                        pass
         else:
             out = _init_pytree(self.scratch_dir, max_size_along_dim0, data)
         self._storage = out