diff --git a/meorg_client/cli.py b/meorg_client/cli.py
index e526ef5..55b7494 100644
--- a/meorg_client/cli.py
+++ b/meorg_client/cli.py
@@ -286,8 +286,9 @@ def cli_analysis():
 # Add file commands
 cli_file.add_command(file_list)
 cli_file.add_command(file_upload)
-# cli_file.add_command(file_upload_parallel)
 cli_file.add_command(file_attach)
+cli_file.add_command(file_detach_all)
+
 
 # Add endpoint commands
 cli_endpoints.add_command(list_endpoints)
diff --git a/meorg_client/client.py b/meorg_client/client.py
index a28f83d..89e1b4f 100644
--- a/meorg_client/client.py
+++ b/meorg_client/client.py
@@ -291,10 +291,22 @@ def upload_files(
                 response = self._upload_file(fp, attach_to=attach_to)
                 responses.append(response)
         else:
+
+            # Disable the auto attach to avoid race condition
             responses = self._upload_files_parallel(
-                files, n=n, attach_to=attach_to, progress=progress
+                files, n=n, attach_to=None, progress=progress
             )
 
+            if attach_to:
+
+                file_ids = list()
+
+                for response in responses:
+                    file_id = response.get("data").get("files")[0].get("file")
+                    file_ids.append(file_id)
+
+                self.attach_files_to_model_output(id=attach_to, files=file_ids)
+
         return mu.ensure_list(responses)
 
     def _upload_file(
@@ -503,3 +515,19 @@ def success(self) -> bool:
             True if successful, False otherwise.
         """
         return self.last_response.status_code in mcc.HTTP_STATUS_SUCCESS_RANGE
+
+    def is_initialised(self, dev: bool = False) -> bool:
+        """Check if the client is initialised.
+        NOTE: This does not check the login actually works.
+        Parameters
+        ----------
+        dev : bool, optional
+            Use dev credentials, by default False
+        Returns
+        -------
+        bool
+            True if initialised, False otherwise.
+        """
+        cred_filename = "credentials.json" if not dev else "credentials-dev.json"
+        cred_filepath = mu.get_user_data_filepath(cred_filename)
+        return cred_filepath.exists()
diff --git a/pyproject.toml b/pyproject.toml
index d6fc847..1fb8475 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,13 +18,14 @@ license = {file="LICENSE"}
 dynamic = ["version"]
 
 # Dependencies
-requires-python = ">=3.11"
+requires-python = ">=3.9"
 dependencies = [
     "requests>=2.31.0",
     "requests-mock>=1.11.0",
     "PyYAML>=6.0.1",
     "click>=8.1.7",
-    "pandas>=2.2.2"
+    "pandas>=2.2.2",
+    "tqdm>=4.66.5"
 ]
 
 authors = [