Can plex save to nfo files?

[FordGuy61]

No.

Plex supports reading the IMDB ID from a .nfo file. No other support.

Here is a feature request to add better support for nfo files:

With Plugin Support Dead - Can Plex finally have native .NFO support?

Natively supporting .NFO files for metadata as part of the Local Media Assets would go a long way for helping people with tons of home movies, alternative versions of films/tv shows, and other difficult to scrape content.