The last few days I have been constantly saving my file. About an hour ago I opened my file and the most recent work wasn't saved even though I'm sure I saved it before closing. What can I do? Also, when I have tried to email it to myself as a backup

The last few days I have been constantly saving my file. A couple of hours ago I renamed the file and then reopened my file a little while later, but the most recent work wasn't saved even though I'm sure I saved it before closing. What can I do? Also, when I have tried to email it to myself as a backup, the fields aren't populated when I open it up. Fyi, I have the free subscription.