The MG80 Pro flash head can be set to the following vertical positions for lighting subjects in front of the camera as well as for bounce flash:  -7˚, 0˚, 45˚, 60˚, 75˚, and 90˚.
The MG80 Pro's Auto Zoom function only works when the flash head is in the 0˚ position (straight ahead). If the flash head is in any other position, for example -7˚ (pointing slightly down), then the Auto Zoom will not sync the flash with your lens' focal length.  To use Auto Zoom confirm that your flash head is at 0˚.
Use Manual Zoom to change the zoom setting on the flash when the flash's head is in any position other than 0˚.