How to add new objects to a scene during animation?

Hello, how can I add an object to the scene so that it starts to appear in the frame where it is needed? I don’t understand how this works. Please, help

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Use opacity parameter of layers to make it appear or disappear in the scene at any given time.

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With a constant interpolator

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Opacity is an option, or alternatively put the layer into a switch and set it to ‘’ for the sections where you’d like the layer to be invisible. I’ve used both approaches to achieve the same outcome. I generally use whichever option comes to mind when I need to do it; same result.