Can you turn a Simulation into Keyframes? Basically, if I have a fluid sim in one blend file, can I somehow turn it into keyframes to form an animation or an action and export it as an animation?
Yes, you can export fluid sim in alembic format (File -> Export -> Alembic) and import to different application with alembic support. It work similar than create shape key for every frame, but it do it smarter way.