Ok, let me put all the things in detail.
Using Unity 5.3.4f1
My Oculus project was doing fine except two major problems.
After submission I got these 2 problems to resolve from Oculus store as below.
1. A back button long-press (greater than 0.75 seconds) must bring the user to the Universal Menu. A “back” short press action is interpreted by the application dependent on its current state, but generally it will retreat one level in an interface hierarchy. The short-press currently does not pause the menu on tap. A series of short press action within the app experience should ultimately bring up to the Return to Oculus Home menu for a user.
2. Your volume buttons must adjust the volume using the VR volume UI provided by the Oculus Mobile SDK. Currently, your volume display does not function as expected.
My Process to solve this issues as follow.
1. I created an empty gameobject and attached OVRplatformmenu.cs and OVRmanager.cs, Here I choose 'Escape' button (which is the back button of Gear VR) in order to quit the game play and take me to Oculus Global menu on long press .
2.Now I have setup the OVRvolumecontrol prefab and also attached the script, And make that a children to main camera. which shows the Volume UI perfectlly in scene mode, But in runtime/Testing that not visible at all!
Both of these solutions NOT WORKING at all.
I had used and tested in separate projects with below plugins.
So If anyone knows the solutions and help my project to re-submission I would deeply appriciate your help and I think so as the community.
Thanks in advance.