How do I add music in duplicate on iPhone Naver Music?

I'm listening to streaming music from iPhone to Naver Music.

How can I add music in duplicate from the playlist?

If you look it up on the Internet, you can go into the settings and do it.

I can't find a menu similar to that no matter how much I look for it.

When adding a song, delete a duplicate song Where can I find this menu?

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