How to recover data from a device that only wifi works

Hello. My phone (mate 10 LITE) is broken and only wifi is working ( I can see it is connected to the my home network by checking my router’s web interface). The usb cable doesn’t establish a data transfer connection. It only charges the phone. No screen, no mhl support, no nothing.

beside wifi, I can install apps to the device over play store’s web page.

so my question is; is there an ftp app or apk like starts work immediately it is installed to the device? I know that doesn’t make sense but I am desperate. So somebody help me please…