How to Save a File to Specific Folder
This topic started years ago and there have been good tips, which work some of the time. They are not universal across MacOS and that is one of the elegances of a true operating system like Mac.
Many are converting from Windows to Mac, such as me, and encounter this problem. So, saving files to the correct folder, or creating a new folder extemporaneously, involves multiple steps: Save, Locate, Create Folder perhaps, Move to destination Folder.
The File Saving protocol varies between Apple applications Safari, Pages, Numbers and Keynote and sometimes within an application. Applications from other vendors use their own protocol and that's something we have to live with.
It seems there is some need for architectural direction.
I'm running High Sierra 10.13.3.