How can I add a specific object to my timeline at a certain frame?
I want to add a flag which should float over a pre-baked water fluid simulation. I baked a drop falling into water. After frame $120$, when the distortion becomes less turbulent, I want a flag to appear on its surface with a transparent text. But how can I tell the timeline that the flag object should start appearing at frame $120$ and that it shouldn't be influenced or be seen by physics before that time?