Insta ScreenShot Share is using the API of "Cast screen" built in Android 5.0.
You can start a screen shot with following ways: 1) Floating button 2) from notification bar tool 3) from Quick Tile
Features: 1) Auto start on boot 2) Quick Tile available 3) Take screenshot and share it from notification 4) Change quality of picture saved 5) Different folder auto created for these screenshots
For any suggestions or bug mail me at hugsofts@gmail.com