Help [Q][APP][REQ] Side Panel Shutter Button Camera App's???

[n1nj4Lo]

I know there's https://play.google.com/store/apps/details?id=com.ehzstudios.quickcamerafornoteedge but it doesn't give you a live camera preview of what you're aiming at, it's more like a spy camera app... So are there any camera app's like the original KitKat Samsung Camera app that had the shutter button on the side edge panel...

Or how possible would it be to backup and restore the kitkat camera on say lollipop or marshmallow in order to keep the side shutter button?

Thanks!