First, you should try using plugboards, see Preferences ==> Import/Export ==> Metadata plugboards. This allows you to define dynamic renaming rules for exported books.
See:
Plugboard, template, and custom composite column recipes for more details, inspiration, and help.
Metadata is never updated in the in-library copy, only on export or when using Polish books or Embed Metadata. You can add either to the toolbar via Preferences ==> Interface ==> Toolbar.