How to add one another library files with different name from the theme name? I try to define a separate library with different name from the theme name, according to this artcle:
Adding stylesheets (CSS) and JavaScript (JS) to a Drupal 8 theme
For example a library with below details:


Theme name: MyThemeName
Library Name: Library A
Library File Name: libfile.info.yml


libfile.libraries.yml

LibraryA:
  version: 1.x
  css:
    theme:
      css/Style.css: {}


And then attach this library to all page in:

MyThemeName.info.yml

libraries:
  - MyThemeName/LibraryA


I would be happy to hear what the problem is, share your experiences and guide me to know what is the right way to add another library files with different name from the MyThemeName?
Thanks for any help.
Short answer: You cannot.

Looking answer:
The purpose to for the libraries file is too define all the libraries of a module / theme.

The file is recognized because it is has the name of the theme/module it is placed at.

If you want libraries with a different namespace then you will need to search for an alter hook, and define these libraries there (not recommended).