Help needed with transferring music from Mac to iPhone

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macOS and Mac Apps

Hello,

I would need a step by step for this task, transferring a song from the mac to the music app on the iphone.
When I'm on the song, I press shift + command + control + option + space bar, and it says mouse pressed.
From this moment on, how exactly do you proceed? I already know how to find the iphone in the finder, and it is assumed that after I have correctly told it to move the song, there will be a way to paste it on the iPhone.

Can someone help me, please?
I have version 10.15.5 of the operating system.

Thank you in advance.

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