Dear Tesa Neel
Good day! Thank you for posting to Microsoft Community. I am happy to help you
First, could you please try uploading the file to OneDrive and then open it in the web app to see if it can be opened, which will help me determine if the file is corrupted. You can visit the Office portal, log in to your account and click OneDrive then upload the file.
If the web client can be opened, try downloading the local to see if the file can be opened. If the downloaded file doesn't open either, I recommend checking if there is an update for the Office app in the following app stores, and try updating to the latest version if there is.
If the web terminal cannot be opened, the file may be corrupted. If that's the case, I'm afraid you'll need to fix it from the Windows side:
How to troubleshoot damaged documents in Word - Microsoft 365 Apps | Microsoft Learn
I look forward to your reply. Thanks for your cooperation.
Sincerely,
Tin | Microsoft Community Moderator