diff --git a/examples/00_run_all_async.py b/examples/00_run_all_async.py
index 7e664cbb..a5c26f75 100644
--- a/examples/00_run_all_async.py
+++ b/examples/00_run_all_async.py
@@ -198,7 +198,7 @@ async def main():
     for example_file in example_files:
         example_name = example_file.name
         timeout = flow_timeouts.get(example_name, args.timeout)
-        result = await run_example(example_file, timeout, suffix)
+        result = await run_example(example_file, timeout)
         results.append(result)
 
         # Break on error
diff --git a/examples/03_basic_commands_async.py b/examples/03_basic_commands_async.py
index adb45214..f2360d3e 100644
--- a/examples/03_basic_commands_async.py
+++ b/examples/03_basic_commands_async.py
@@ -3,6 +3,7 @@
 
 import asyncio
 import os
+import sys
 
 
 import random
diff --git a/koyeb/sandbox/filesystem.py b/koyeb/sandbox/filesystem.py
index 25998044..b4cf0fa6 100644
--- a/koyeb/sandbox/filesystem.py
+++ b/koyeb/sandbox/filesystem.py
@@ -308,7 +308,7 @@ def write_files(self, files: List[Dict[str, str]]) -> None:
             path = file_info["path"]
             content = file_info["content"]
             encoding = file_info.get("encoding", "utf-8")
-            self.write_file(path, content, encoding)
+            SandboxFilesystem.write_file(self, path, content, encoding)
 
     def exists(self, path: str) -> bool:
         """Check if file/directory exists synchronously"""
@@ -352,7 +352,7 @@ def upload_file(
         with open(local_path, "rb") as f:
             content_bytes = f.read()
 
-        self.write_file(remote_path, content_bytes, encoding=encoding)
+        SandboxFilesystem.write_file(self, remote_path, content_bytes, encoding=encoding)
 
     def download_file(
         self, remote_path: str, local_path: str, encoding: str = "utf-8"
@@ -368,7 +368,7 @@ def download_file(
         Raises:
             SandboxFileNotFoundError: If remote file doesn't exist
         """
-        file_info = self.read_file(remote_path, encoding=encoding)
+        file_info = SandboxFilesystem.read_file(self, remote_path, encoding=encoding)
 
         if isinstance(file_info.content, bytes):
             content_bytes = file_info.content
@@ -388,7 +388,7 @@ def ls(self, path: str = ".") -> List[str]:
         Returns:
             List of file/directory names
         """
-        return self.list_dir(path)
+        return SandboxFilesystem.list_dir(self, path)
 
     def rm(self, path: str, recursive: bool = False) -> None:
         """