I have a standalone version of Excel (16.49) running on my M1 Mini. I just realized that no document, even if left open for hours, will save any changes until I specifically hit Command-S. I'm not saving to the Cloud, and all docs are on the main drive. Is this normal behavior? I can't find any settings for Save, except Preferences, and the 3 boxes in the Save tab are checked (none really have anything to do with autosave). Any suggestions?