How can I tell if my Samsung S7 supports connecting to a wired ethernet via a usb OTG cable? I want to connect my Samsung S7 to a wired ethernet connection using something like this usb micro > Ethernet hub

Their instructions say to look for Ethernet option under Settings> Networking 
But I see not such option.

Folks are reporting that the Samsung does not support wired connections
Like any other computer system Android also requires a driver for talking to a device. 

However unlike regular PCs you can't just install a driver, instead you only have the drivers the manufacturer included when building the Android system.

In a terminal or on an adb shell you can list all the drivers that were included in your kernel:

ls /system/lib/modules


If the list contains for example the driver usbnet there is a chance that an USB Ethernet adapter may work.