Moto 360 2nd Gen cannot take photo as a remote shutter with my XT1575

I opened Moto Camera on my xt1575, the watch prompt me to take photo with it, swipe to the left and the shutter icon show, when i press the shutter, the watch screen flash once, but no photo were taken, nth happen on my xt1575.

Does anyone know this issue and how to fix it? Did i missed sth else?

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