ok. I am not sure if this will answer the question, but according to penand the pad,By allowing the writer to present a story within a story, a frame narrative leads the reader from the first story into another one, which is within the overall story. This guidance allows the frame narrative to establish the context for the embedded narrative, and, more specifically, call attention to the situation of how the story is told. The resulting effect of the guidance is that the frame narrative allows the writer to create the context for how the narrative should be interpreted." it has the explanation but i hope it helps some way or another.