The app shut down and everything written disappeared

The app shut down and everything written disappeared

Hello! I had a problem while using the app.

Due to a crash, the application was closed, and after re-logging in, the document was empty. I know for sure that it was saved all the time while I was updating it for these two days, but neither the old changes nor the new ones are displayed in the document history.
Can you tell me if it is possible to return the document to the previous version, and how to do it?