I just purchased a DJI Smart Controller, have three DJI drones that it can control and it works with Litchi!
BUT:
The Smart Controller uses Amazon Appstore to download Litchi and will not download it unless you buy it, I have paid for it on google for my Galaxy devices (phones/tablets) - How do I get the version of Litchi that works with the Mavic 2 Zoom and Mavic Mini 2?
I found the answer: In Help FAQ #10 Apple, Amazon, Goggle each require payment
That’s right…
Instructions for installing Litchi on DJI screens: