My father did a lot of storytelling. He invented lots of stories. Walking in the woods with him, we asked for a story, he did his walking storytelling. When I grew older he told me he almost never knew the next part of the story. He had to invent it sometimes just seconds before telling the story. But he did also prepare stories when at work.
Telling a story is like playing a game. The storyteller is capturing the listeners in a web of sentences and emotions. The story has its rules. The listeners do engage in the story by bodily reactions, emotional signs.
Digital storytelling is not like the P2P emotional web of the story told face to face. It is more like writing a book. Listeners or readers reactions (mostly) do not help shaping the story.