I appreciate this question was asked and answered back in 2012, but this is 2019 and I'd like to know if there is a different problem. I spent 6 hours working on a document in SharePoint in the browser window. It looked like everything saved fine (remember, there is no 'save' button when working in a browser) but 1 week later, and a few additional entries later, some additions/changes stuck, but the lions share from a week ago have disappeared. My coworker was having trouble getting her work to save while working on the desktop version and saving.
I work for a governmental agency so am not able to do a lot except clear my cache. I don't want to spend another 6 hours re-entering the work only to have it disappear again. I'm on a deadline. Any help is appreciated. Thanks