Lark M2S stereo on camera

Hi there, I recently purchased the Larm M2S.  I see that I can record stereo (each transmitter on it's own channel) on my phone, but I cannot figure out a way to do it with my camera.  Is this functionality not available when using the 3.5mm stereo cable to the camera?

It actually IS in the manual :|  I just overlooked it.  You need to hold the volume button for 3 seconds for it to switch from mono to stereo.