Attitude Signal or Count Signal?

A very common question: is this a situation where I should give an attitude signal or a count signal? Adam answers a student's question that came up in a notrump contract.
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[@zihanqiao2850]

If the attitude is already known by partner, we can play count signal.

[@gerryarty8342]

Great .. thanks :)

[@susandiamond3434]

What if you play upside down?