A Microsoft file hosting and synchronization service.
Hello CarolineNess,
I am Jaspreet Singh.
Did you restore your system before checking for the version history?
The data can also be lost if the file was saving locally and has not yet synced before the system restarted/crashed.
If you were using Microsoft word application in your desktop try the recovery method for the same here : https://docs.microsoft.com/en-us/office/trouble...