Hi bros, i never like Xiaomi. I have the experience to help setup one Xiaomi china version. First it lag after some app has been installed. Then installing app from the app store
and from other sources (many app missing or not supported)

However, it is cheaper compare to other type of box.

To resolve how you could installed apk, installed x-plore file manager first. Then you can use x-plore to link to your google drive.
This way you can place all your apk on the google drive then installed the app from the drive

Hope this help you.

i just got a google tv chromcast. pls pay attention that it come with a hdmi and a power usb and there is no usb and no other access to the device. if u plan to use it as it is with youtube,netflix and those premium service this is a good device. However, if you intent to sideload app, it is going to be tricky.
I did successful sideload apk and installed into the device.
i download from the playstore send to tv and i send sendanywhere apk up and get installed the apk not without any problem and the system to go setting to allow installed from unknow source which i need to click the button to approve. Since there is no mouse, there is no way to click the button. What i did was in my android phone i installed a bluethooth mouse and pair it with the device making my handphone as a mouse.
thereafter i use sendanywhere to send apk into the device to get it installed.
anyone want a detail how i setup pm me