You are the narrator, and you are the only necessary entity between the story and the audience.
The narrator is not a lorist, folk or otherwise. As you are the narrator, the narrator knows everything you know; to the extent “author” carries any weight, you know everything there is to be known. But while that may be the author’s privilege and responsibility, it isn’t the narrator’s.
The narrator’s responsibility is to tell, deal, dole, recount the story, the tale, such that the audients have the experience of observing it themselves. What they could not observe, were they in (at?) the story, cannot be told. Of the rest the narrator makes selection, is no way passive, or random, or exhaustive. But the selection must itself serve the telling.
It is true that sometimes the narrator is doubled, an additional layer between the story and the audience, a mask you wear. Such a narrator may share with the audience things the audience could not observe.
But such a narrator is also a character in the story, or at least in the universe of the story. This justifies such sharing in exactly the same way dialogue between two characters can share what the characters know (or think, or think they know) which the audience could not observe. The selection is still yours, still serves the story.
The story, not the lore.