Just Save in Reader - Stop the Save Slog

How do I abolish the ridiculous save slog in Adobe Reader? 

Click the Save button. Dialog box opens. Why? Click Save again. Message box: file.pdf already exists. Do you want to replace it? Well, yes, didn't I hit the Save button already? Click Yes. Now I'm done. Why do I have to go through this all the time?

I have tons of files to save. This wastes a lot of time. 

Why should I even have to save at all? Shouldn't it just automatically save?

I had it set up before to just save when I click the save button. How do I get that back again?