A Microsoft file hosting and synchronization service.
Hi. Are you signed in to OneDrive with the same Microsoft account you used when the files were created? To recover your missing OneDrive and Excel files, check these:
Open OneDrive or go to https://onedrive.live.com/recycle and look in the Recycle Bin.
Open Excel, go to File > Info > Version History to see older versions.
Make sure OneDrive is fully synced in Settings > Account.
Use the OneDrive search online to locate misplaced files.