A family of Microsoft word processing software products for creating web, email, and print documents.
The AI response re AutoRecover is useless. The AutoRecover feature is effective only in the event of a critical failure... And not always successful.
A major consideration is where the document is stored. Remote clouds [such as iCloud, G👀gle Cloud, etc.] are not adequately designed to support editing of Office documents. Users often report data loss similar to what you describe. Always edit on local device(s). Use remote locations only for archiving & backups.