Has anyone made the YN 560 III fire correctly in multi mode? On my G6 the camera does not appear to be sending the right signal to the flash to fire multiple times. 1 second exposure, flash set to 3x3. The pilot button on the flash gives 3 flashes, but the camera only triggers one flash. I get the same result with the flash on the camera or the TX 560 mounted on the camera. First curtain vs second makes no difference.