Hi,
these days I try to use an USC-C to Ethernet Adapter from Anker. (https://www.amazon.de/Anker-Ethernet-inklusive-ChromeBook-Aluminium/dp/B010086WNA)
It was just plug and play on a Huawei Android 9 mobile. Also it Has worked on the latest stable Xiaomi.eu release on a Xiaomi Mi9Tpro. Just...