This is a common issue in any animation work-flow, using any software,.. people imagine the animation in their heads, like a “final production” and then try to animate it that way,
Without including the “Editing process”, to combine different clips of animation into a “final production” sequence.
If you think about making the intro (establishing shot),... then make the next section (the physics) falling objects
then the next section,... etc…
You’ll end up with a set of Sequenced images, or animations, which can be compiled / edited, and post produced, to add additional effects, or sound.
It’s an easier way to work (especially with physics objects), where (right now) there’s no way to trigger a physics simulation to begin or end at specific points in time.
So, breaking up the “complete animation” concept in your head,.. into manageable chunks. is what’s needed.
Hope it helps