If I am the main account, and I turn off the sound in my app, can people I’ve shared the cameras with turn it on, or just me?
The camera owner controls whether sound is saved during recording, and the shared user cannot change that.
Either or both of the owner and shared user can listen to the live stream sound. The owner can’t control shared user’s access to the live stream sound; it is always available to them.
You didn’t ask, but, the owner and shared user can both turn on/off the camera and enable/disable per-camera push notifications. A change made by either affects both.
At the topic below, you can vote for better control of shared user permissions. Be sure to click the VOTE button at the top: