Outlook 365 New won't add attachments from OneDrive - Error Download Failed

Trying to help my neighbor but a little lost because I don't use OneDrive. His setup is Dell13th Gen Core i7 AIO running Win11 Home and Office 365 w/ New Outlook. His documents are saved to OneDrive and the folder on the c: drive under Users/HisUserName are empty. He has a second D: drive that he uses to backup his files. Starting about 2 weeks ago when he tries to send an email with outlook and selects attach a file and selects the file, it asks whether to attach a link or attach a copy of the document. When he selects attach a copy of any file in his documents on OneDrive, it fails and an error pops up saying download failed. If he attaches a file from his D: drive or his C: drive it goes through just fine. I updated Win 11 and Office to latest updates. I also ran SFC /scannow which found a few corrupt files and fixed them and DISM /Online /Cleanup-Image /RestoreHealth which ran fine. Any suggestions welcomed. Thanks in advance.

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You may have hit a known bug. I can't reproduce, so I can't test possible solutions. No fix that I have seen.

Can't download OneDrive files as an attachment to Outlook emails. - Microsoft Q&A

Updated: I've tested this on my device today and observed the same behavior specifically Classic Outlook, while New Outlook works as expected. So, if you're using Classic Outlook, please consider switching to New Outlook temporarily and see if that helps.

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I would suggest you open the Microsoft Link and click the "Follow Question" button so you'll see any updates from Microsoft.

Thanks. It must have been a bug because he now reports it's working again.