Your question is Cross-Platform Feature Architecture. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about how you would architect a cross-platform feature (web, iOS, Android) for a well known music application to maximize reusability while identifying areas needing net-new contributions and ensuring scalability across platforms.