PrintScreen with alpha in background

Hi, I'm want to take a print from the game with a object in the center and the background with alpha, I have done that in Editor, but when I compile to android I dont get the alpha in background.

This is the code that take the picture, the camera in editor is with alpha in color: yield return new WaitForEndOfFrame();

 EndGameManager.HandPrintColor = CameraNailPainter.backgroundColor;
 EndGameManager.HandPrint = new Texture2D(Screen.width, Screen.height, TextureFormat.ARGB32, false);
 EndGameManager.HandPrint.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
 EndGameManager.HandPrint.Apply();

Has anyone some suggestion the way to go on this?