cl.Message() update() not working aysnchronously

I'm facing an issue where the `cl.Message().update()` method is not updating the message content asynchronously as expected in my file processing application.

Here's the relevant part of my code:

```
@cl.on_chat_start
async def start():
# ...

msg = cl.Message(content=f"Processing `{file.name}`...", disable_feedback=True)
await msg.send()

# Process the file and split into chunks
chunks = split_into_chunks(file)

msg.content = f"Creating chunks for `{file.name}`..."
await msg.update()

# Store the data in form of embeddings
vectordb = store_embeddings(chunks)

msg.content = f"Creating embeddings for `{file.name}`. . ."
await msg.update()

# ...
msg.content = f"`{file.name}` processed. You can now ask questions!"
await msg.update()
```