LG g5 has Qualcomm Snapdragon 820, but G5 SE has Qualcomm Snapdragon 652.
1st find out if you use camera2api. you can do that from adb command getprop | grep camera, or download
Camera2 API Probe. If you have camera2api enabled (you will see a line persist.camera.HAL3.enabled 1), then try to install again one apk from this thread and if this doesn't work again, try a mod made for qualcomm 652 like this one https://drive.google.com/file/d/0B-OyWgX7x68mdzV5UTNudzNUZVk/view.
If you don't have it enabled, then search how to enable it. You might need root.