A Microsoft file hosting and synchronization service.
Hi, I'm Diane and I'm happy to help you today.
Is the alias a brand new account or an alias added to your existing OneDrive account?
If its one account with 2 aliases, all files are in the existing OneDrive, regardless of which alias was signed in to upload.
If it is a totally separate account, you can only be logged into one personal account in the app at a time. You'll need to unlink the existing account and link the new account.
To verify if they are one account, log into https://account.live.com/names/manage - are both addresses listed?
Let me know how it goes, I'm here to help you further if needed.
-- Diane