Correction to original post, I have typo and did not put in "plug" for plughw. aplay /usr/share/sounds/alsa/Side_Right.wav -D plughw:CARD=Audio,DEV=2

Updated test:

Got it, Yes that is correct.

The pwm driver is present there. It is necessary to add the overlay correctly. Is your device an orange-pi-zero-3?

Can you tell us what you did? diff old.dts new.dts