The content in Word is gone.

It sounds like you are experiencing issues with a Word document that contains mathematical formulas, which have turned into question marks (???), and you are unable to recover the lost content. Here are some steps you can take to try to recover your document:

1. Check AutoRecover Files: If you have a Microsoft 365 subscription, you can check for AutoRecover files in the following locations:
   • C:\Users\<UserName>\AppData\Roaming\Microsoft\Word
   • C:\Users\<UserName>\AppData\Local\Microsoft\Office\UnsavedFiles Replace <UserName> with your actual username.
2. Recover Unsaved Documents: Open Word, go to File > Info > Manage Document > Recover Unsaved Documents to see if there are any unsaved versions available.
3. Use the "Recover Text from Any File" Converter: If the document is damaged, you can try to recover text from it by selecting File > Open, then in the Files of type box, choose Recover Text from Any File (.) and select your document.
4. Check OneDrive Version History: Since your document is stored on OneDrive, you can check the version history by right-clicking the file in OneDrive and selecting Version History to see if there are earlier versions available that may contain the missing content.

If these steps do not resolve the issue, you may need to consider reaching out to Microsoft support for further assistance with your specific problem.