Pretty sure controls don't work at all for any device with graal, This may or may not be different for West, Zone and Era, But on classic I cannot get my controller to connect to Ipad/Iphone 7 to Iphone X where the only thing i can do is walk(May effect models earlier, I only have the Iphones through 7 to Iphone XS and some Ipads), Every Android Device i have is also the same from the Razer phone to Samsung devices and others. this is also the same i experienced on PC.
Controllers work if you just plan to walk. Nothing else. Doesn't seem like they plan on updating controller support despite it being requested a lot.