The Onkyo App will not work with the HT-R670. This receiver is part of the HT-S6200 Home Theater package and is not network compatible. You might be able to use the Logitech Harmony Hub and app or another remote control app paired with an IR repeater pointing at the receiver. Some universal remotes may support changing the inputs on the receiver. However, I don't know of any specific model that will work. The Logitech Harmony remotes are probably the most likely to support the Input button; it may take programming a specific button to match the receiver's Input function. If you need a replacement for the original remote, one source is https://www.amazon.com/OEM-Onkyo-Remote-Control-HT-S6200/dp/B0137R62H2
. The manual for the HT-S6200 is available here: http://www.intl.onkyo.com/downloads/manuals/pdf/ht-s6200_manual_e.pdf
I can't find an Onkyo HT-R360 listed even as part of home theater system. There is an Onkyo HT-RC360. The manual for that is http://redirect.onkyousa.com/redirect_service.cfm?type=own_manuals&file=SN29400649_HT-RC360_En_web.pdf
. While this model has a network connection, it is not compatible with the Onkyo app either.
I wish that I had better news for you.