Welcome to the forum.
John T's link will be useful.
However, I want to make sure that you have the terms correct, as in Premiere-speak, "Save, Save_As and Save_As_a_Copy" are only for the Project file, the .PREL.
What you are speaking of is outputting an AV file from that Project. In PrE, that was once called Export, but was then changed to Share, and is not called Publish+Share.
The various forms of Save do NOT yield an AV file - only a variation (usually in name, or location) of the Project file. Many folk confuse the Save functions with outputting, and if you Search the Help File, or even the Internet, you might get onto the wrong track.