Cubase does not see or detect some sounds. Why? What to do?

In MediaBay, next to some sounds, which are quite a lot, there is a question mark: “?”. And these sounds are not reproduced. They cannot be heard or used. They seem to be there, but for some reason they are inactive. What is the problem? Someone can explain? Here’s a screenshot so you can see what I’m talking about.

Hi and welcome to the forum,

The reply is written in the manual, here.

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