I am having the same issue, when I activate the app it says to insert your device into Gear VR. Then I get an error “Thread priority security. Make sure the APK is signed.” I have read here that this is caused by the OSIG file not being in the right place. well when I went to the root and eventually opened Android, it’s supposed to have an assets folder. Well, none of my versions of UE have an asset folder in the android folder. Could that be the problem? I created an asset folder and dropped the OSIG there but I am not sure it is working. please help!! 