Permalinks Sub-Category Not Displaying

Hi —

I have permalinks set to display category/postname. I also have several sub-categories named specifically to support natural search performance.

The permalinks documentation states that “Nested sub-categories appear as nested directories in the URI.” However, post URLs are only displaying the top-level category. The sub-category is dropped. Please advise — is there a syntax addition that will enable the inclusion of the subcategory (as a nested directory)…e.g. URL.com/category/subcategory/postname

Also, the documentation states “Starting Permalinks with %category% is strongly not recommended for performance reasons.” Can anyone expand on this?

Thanks,
Wesley
https://www.naturalapertures.com