Hi @Minh Bui
Welcome to Microsoft Q&A! Thanks for posting the question.
I have tried with "Uploade Files" and I am able to do it without any error.
What kind of file you are trying to upload and what's the file size? Also, are you trying to use the vector search? Can you please Capture a browser trace for troubleshooting - Azure portal | Microsoft Learn share it with us for further investigation.
Also, can you please check if Cross-Origin Resource Sharing (CORS) for Azure Storage is enabled.
Thanks
Saurabh