I'm experienced with Windows, not so much with Mac. I find myself often renaming documents from within the Open and Save As dialog box windows. I hope the description below makes sense to explain what I mean.
If you look carefully you can see the picture below is of the Open dialog box of Microsft Word in Windows.
In the example above, assume I was going to open the document called The Leadership Factor, but before I did this I realized that the filename of the document above was wrong. So I can click on this document (see how its highlighted) and if I want I can now rename it so that it ends with '2017' instead of '2013'. After renaming it, I can then click on the document called The Leadership Factor to open it up.
Can I do the same thing in macOS?
Best Answer
Yes and No. Let me explain.
Yes
You can do the same thing from within the Open dialogue window of an application, however it is not done by clicking on the filename to highlight it. Instead, you need to right-click on the filename and select Rename. This then highlights it and you can rename it as you wish.
If my explanation isn't clear, please let me know and I'll upload a couple of screenshots.
No
Unfortunately, macOS does not allow you to rename a document from within the Save As dialogue window. This may actually be a bug because right-clicking on a filename does in fact give you the Rename option, it's just that it doesn't actually allow you to rename the document.
In fact, now that I'm thinking about this, I suggest you send in some feedback to Apple. When you do select Bug Report as your feedback type, and for feedback area select the Desktop/Finder/Filesystem option. I'll do the same, because you either shouldn't be able to select Rename from within the Save As dialogue window, or it should work since you can select it.