Answer:
Joseph Conrad's use of a frame narrative in Heart of Darkness affects the story because It allows the narrator to share reflections about previous important events.
Step-by-step explanation:
"Heart of Darkness" by Joseph Conrad is a story where the author used the technique as a new way to tell the story, he decided to follow the influence of the medieval tendency of Geoffrey Chaucer and Boccaccio, all this to add detail and explain secondary events that help the reader to get a wider vision of the story.