One space per module
The organising unit is a space, and the natural mapping is one space per module. Everything for that module goes in it: the lecture decks, the recordings, the reading list, the problem sheets, the photographs of the whiteboard. Grounded chat then answers across all of it at once, and cites whichever source it drew on — a page in the reading, a slide, or a timestamp in the lecture audio.
That is the whole idea, and it's why a semester feels different from week two onwards: you stop hunting for which PDF had the thing, and start asking the module a question.
The lecture is the highest-value thing you're throwing away
The slides are an outline. The substance was the fifty minutes of talking around them, and unless you recorded it, it is gone — which is why revision from slides alone produces students who "know the slides" and are then surprised by the exam. Record the lecture, put the recording in the space with the deck, and your notes are built from both. See also slides to study notes.
Then share the material, not the marks
A shared folder lets a whole module cohort pool material: the syllabus goes in once, someone uploads the reading they scanned, and everyone's answers cite the same pages. There are no seats to buy — you invite people with a code.
What stays private is your progress. Your flashcard history, your quiz scores, your chat — yours alone, and invisible to the group. Sharing material makes a cohort better. Sharing scores makes it a leaderboard, and a leaderboard makes people hide what they don't understand, which is the opposite of the point. More on study groups.