The LinkedIn docs for the articles API show that I can get a particular article's content etc. by doing a
GET https://api.linkedin.com/v2/originalArticles/{originalArticlesId}
But it's not clear to me where I get that originalArticlesId from. How do I list the articles that any given user has saved?
The LinkedIn API does not yet provide that functionality. The closest you can get to what you are looking for is to get the articles published by a particular author.
GET https://api.linkedin.com/v2/originalArticles?q=authors
I think that if you want to have this functionality you will have to do a scraping of the profile of the person who requires this functionality.