Remote together seems to be in steam SDK 1.47 and explain why it's not working (current on construct is 1.42 if I remember).
I've tested putting the 1.47 SDK inside the package and nothing change. Greenworks plugin don't seems to support this SDK version.
Mouse / keyboard are working but the controller are not detected and no video are sent...
An update should fix everything, let's hope someone will update it, it will open an easy way for multiplayer for contruct 2 / 3.