@VENKATA BONDELA Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
May I know how are you trying to upload( Portal, Azcopy, Storage explorer, REST API) ?
Can you share the screenshot of the error message?
I assume SAS token would be probably expired or permission issue or On the Azure Portal look for your storage account Firewall was enabled.
(Storage Account -> Networking -> Allow Access from "Selected Networks")
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