The live preview works. I have it working with the SC2. It also works with the RICOH THETA official app.
The return value (JSON format response) is incorrect and is different from the V/Z1.
It’s possible that your app is sending another API command at the same time as the live preview and thus crashing the app. This doesn’t occur with the V/Z1, but does occur with the SC2. I’ll send you a note by email. I’m going to send it to the email you used to register on this forum.
Also, this may help.