diff --git a/README.md b/README.md
index a11715de1..3d09ce0e8 100644
--- a/README.md
+++ b/README.md
@@ -711,7 +711,9 @@ Usage: lean cloud object-store set [OPTIONS] KEY PATH
 
   Sets the data to the given key in the organization's cloud object store.
 
-  :param key: The key to set the data to. :param path: Path to the file containing the object data.
+  :param key: The key to set the data to. The cloud stores a key that does not follow the object store key format under
+  a sanitized name, with a warning naming the key to use from then on. :param path: Path to the file containing the
+  object data.
 
 Options:
   --verbose  Enable debug logging
diff --git a/lean/commands/cloud/object_store/set.py b/lean/commands/cloud/object_store/set.py
index 5794af051..237fec67b 100644
--- a/lean/commands/cloud/object_store/set.py
+++ b/lean/commands/cloud/object_store/set.py
@@ -11,6 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from html import unescape
 from click import command, argument
 from pathlib import Path
 from lean.click import LeanCommand, PathParameter
@@ -23,7 +24,7 @@
 def set(key: str, path: Path) -> None:
     """Sets the data to the given key in the organization's cloud object store.
 
-    :param key: The key to set the data to.
+    :param key: The key to set the data to. The cloud stores a key that does not follow the object store key format under a sanitized name, with a warning naming the key to use from then on.
     :param path: Path to the file containing the object data.
     """
     organization_id = container.organization_manager.try_get_working_organization_id()
@@ -31,4 +32,7 @@ def set(key: str, path: Path) -> None:
     api_client = container.api_client
     with open(path, "rb") as file:
         bytes_data: bytes = file.read()
-    api_client.object_store.set(key, bytes_data, organization_id)
+    response = api_client.object_store.set(key, bytes_data, organization_id)
+    # the cloud encodes the key in its messages for web pages
+    for warning in response.get("warnings", []) if isinstance(response, dict) else []:
+        container.logger.warn(unescape(warning))
diff --git a/lean/components/api/object_store_client.py b/lean/components/api/object_store_client.py
index 76cd6bb5f..e82f5fa53 100644
--- a/lean/components/api/object_store_client.py
+++ b/lean/components/api/object_store_client.py
@@ -80,11 +80,12 @@ def get(self, keys: [str], organization_id: str, logger: Logger) -> str:
 
         return data["url"]
 
-    def set(self, key: str, object_data: bytes, organization_id: str) -> None:
+    def set(self, key: str, object_data: bytes, organization_id: str) -> dict:
         """Sets the given key in the Object Store.
         :param key: key of the object to set
         :param object_data: the data to set
         :param organization_id: the id of the organization who's object store to set data in
+        :return: the api response, with the key the object was stored under and any warnings about it
         """
         payload = {
             "organizationId": organization_id,
@@ -93,7 +94,7 @@ def set(self, key: str, object_data: bytes, organization_id: str) -> None:
         extra_options = {
             "files": {"objectData": object_data}
         }
-        self._api.post("object/set", payload, False, extra_options)
+        return self._api.post("object/set", payload, False, extra_options)
 
     def list(self, path: str, organization_id: str) -> str:
         """List all values for the given root key in the Object Store.
diff --git a/tests/commands/cloud/object_store/test_set.py b/tests/commands/cloud/object_store/test_set.py
index f282c14bc..72b884789 100644
--- a/tests/commands/cloud/object_store/test_set.py
+++ b/tests/commands/cloud/object_store/test_set.py
@@ -35,3 +35,41 @@ def test_set_sets_value_when_path_is_given() -> None:
     with open(file_path, "rb") as file:
         bytes_data: bytes = file.read()
         container.api_client.object_store.set.assert_called_once_with('test-key', bytes_data, 'abc')
+
+
+def test_set_prints_the_warnings_the_api_returns() -> None:
+    create_fake_lean_cli_project("test", "python")
+    api_client = mock.Mock()
+    api_client.is_authenticated.return_value = True
+    api_client.object_store.set.return_value = {
+        "success": True,
+        "key": "trade log_ AI _ Cloud.csv",
+        "warnings": ["Key 'trade log: AI & Cloud.csv' is not supported: unsupported characters ':', '&'. "
+                     "Using 'trade log_ AI _ Cloud.csv' instead"]
+    }
+    initialize_container(api_client_to_use=api_client)
+    file_path = str(Path.joinpath(Path.cwd(), "lean.json"))
+
+    result = CliRunner().invoke(lean, ["cloud", "object-store", "set", "trade log: AI & Cloud.csv", file_path])
+
+    assert result.exit_code == 0
+    output = " ".join(result.output.split())
+    assert "Key 'trade log: AI & Cloud.csv' is not supported: unsupported characters ':', '&'. " \
+           "Using 'trade log_ AI _ Cloud.csv' instead" in output
+    with open(file_path, "rb") as file:
+        container.api_client.object_store.set.assert_called_once_with('trade log: AI & Cloud.csv', file.read(), 'abc')
+
+
+def test_set_prints_no_warning_when_the_api_returns_none() -> None:
+    create_fake_lean_cli_project("test", "python")
+    api_client = mock.Mock()
+    api_client.is_authenticated.return_value = True
+    api_client.object_store.set.return_value = {"success": True, "key": "folder/trade_log-2024.csv", "warnings": []}
+    initialize_container(api_client_to_use=api_client)
+    file_path = str(Path.joinpath(Path.cwd(), "lean.json"))
+
+    result = CliRunner().invoke(lean, ["cloud", "object-store", "set", "folder/trade_log-2024.csv", file_path])
+
+    assert result.exit_code == 0
+    assert "is not supported" not in result.output
+    container.api_client.object_store.set.assert_called_once_with('folder/trade_log-2024.csv', mock.ANY, 'abc')