I have tried an LG G5 (Android 7) and an LG G3 (Android 5) with Commander One on my Macbook Pro with El Capitan.
It was driving me nuts, because the phones were not even recognised by Commander One. Tried everything, but nothing worked.
I finally got hold of a different phone, an Honor 7 with Android 6, plugged it into the Macbook Pro, and it appeared immediately in the Commander One window. Drag and drop worked perfectly.
So it would seem that for some reason, Commander One does not work with LG phones.