Games : How do I use a custom-custom song?

Analogy:

In The Impossible Game, its level editor allows you to choose your own song by simply pressing Ctrl + A or clicking the "Open Audio" button.

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Question:

Is it possible to do that in geometry-dash? (Store link)

The closest thing I've found to that is this:



Which basically restricts me to anything on newgrounds.com.

Can I use a custom-custom song? If so, how?

Obviously on a map that I definitely plan on not uploading, but for my personal use.