ATTACH A ONDRIVE FILE TO OUTLOOK i GET THE FOLLOWING MESSAGE "UNABLE TO DOWNLOAD xxx.DOCX THIS JUST STARTED TO HAVE LAST WEEK

The behavior matches a known Outlook issue with attaching OneDrive/SharePoint files where an error appears instead of attaching the file.

For Outlook for Microsoft 365 on the Semi-Annual Channel, this issue was fixed by a service update. Until fully resolved in the environment, use the documented workaround to attach directly from OneDrive instead of from the recent/suggested list:

1. In Outlook, open a new email (or Reply/Forward).
2. Go to the Insert tab.
3. Select Attach File.
4. Choose Browse Web Locations.
5. Select OneDrive.
6. Browse to the document and insert it.

If using the new Outlook experience, a similar path is available:

1. In a new message, select Attach File on the Message tab.
2. Choose OneDrive under cloud locations.
3. Pick the file and then choose whether to send a link or a copy.

If the error persists even when attaching directly from OneDrive, check whether sending a link instead of a copy works (this keeps the message small and uses the cloud file directly).

References:

• Outlook unable to attach OneDrive or SharePoint files to emails
• Add pictures or attach files to emails in Outlook