Hi,
Today I spent a few hours looking for a way to activate USB tethering automatically when connected to USB.
Counldn't find any proper answers, I ended up making my own flow on Automate app.
Below is the link for the whole backup settings of my Automate app.
I hope this could save your time.
https://drive.google.com/open?id=17QkCwe4IUxj_kO-QCNlVlusLqtWsdReU
This simply turns on USB tether function imitating my actual behaviors to turn on USB tether.(UI events)
Please note that this is only tested on my Samsung Galaxy S8+
(will probably work on other cellphones though)
Have a good day !
by MyungDragon