Google's Daydream View VR headset is a great way to experience the world of virtual reality on your Google Pixel phone. With Google initially limiting the number of phones and applications that can be used with the Daydream View, Google is trying to maintain a premium user experience in a way that is very Apple-like. This also means that it's hard for popular third party 360 cameras like the Ricoh Theta S to be used with the Daydream View.
Since there is no way to open the Ricoh Theta S App or access its content directly from the Daydream App, this means you aren't able to easily enjoy your Ricoh Theta S's 360 content using the Daydream View.
Within the Daydream App's VR Settings, we tried changing the headset to see if somehow help.
However, when we tried changing it to a Google Cardboard VR headset from Unofficial Cardboard, the Daydream App warned that a Daydream-ready headset was required and couldn't be used with the Cardboard VR headset.
The trick to viewing this content in one of these VR headsets is to select the display icon on the bottom right of the 360 content. Unfortunately this means you need to do this on the phone before you insert the phone into the VR headset which can be annoying and makes you wonder why you can't use the Daydream View for this.
After selecting the display icon, you can Switch the screen to VR view (twin lens).
This now allows you to enjoy the 360 content with your Google Cardboard VR headset.