So I took the right speaker from my friend who has the later Z623, anyway my subwoofer is working with that. I guess, the bass knob is the culprit. Anyone found which one works, or is there anyway to repair it ?
It is incremental. Though you can change it in the settings. I am only able to backup in low quality since I have a Pixel 2 XL, additionally sometimes few video files have problems uploading over Google photos.