I am not smart with Android apps yet so I would apprecicate some help I have a Nvidia Shield and I found an app to use 4k images on the Daydream (screen saver) versus the horrible default. I found someone that made this app 9 months ago but the creator has been unresponsive. Attached is the zip file I found and the APK file. I found how to change the images in the .zip file but I can not get it load like the original .apk file he has. I tried just chaning .zip to .apk but the Shield installer did not reconize it (it installed the original .apk file fine). If I change the .apk file to .zip, it is not the same as the original .zip file so I cannot find how to change the backgrounds.