Sorry that you're unable to see the changes that you made on the file 3 days ago. We'd love to get more details about this. Would you mind sharing the version of Adobe XD and OS build which you are using? Please collect the logs using the log collector tools available here: - How to use the Creative Cloud Log Collector tool and share the link of the logs with us.
I would also like to know if this happened with a specific file or you have encountered this experience with other files as well?