If the issue is in the Copilot mobile app on Android, the supported workaround is to stop opening the file from Copilot and open it from the dedicated app instead.
- Install the separate Microsoft Word, Microsoft Excel, and OneDrive apps from Google Play.
- When a file is downloaded, choose Download or Save to device.
- Open Word or Excel directly.
- Go to Open > This device > Downloads.
- If a cloud copy is needed later, use Save As and choose This device or OneDrive.
This avoids Copilot automatically opening the download and uses the app that normally handles that file type.
If the behavior continues in the updated Copilot app, report it from the app:
- Select the ellipsis (…) in the upper-right corner.
- Select Send feedback.
- Select Report a problem.
- Include when it started, the phone model, Android version, and a screenshot.