ScreenCapture is a very useful plugin.
With this asset you can capture screens and save to PhotoGallery (Android) or Camera Roll (iPhone).
WEB DEMO
Features :
-ScreenCapture works on all platforms, including Android, iPhone and web browser
-ScreenCapture can save the captured images to the Photo Gallery in Android
-ScreenCapture can save the captured image to the Camera Roll in iPhone
-ScreenCapture can capture an image and save it as a file in the Unity editor
-ScreenCapture supports full screen capture
-ScreenCapture supports the capture of certain parts
-ScreenCapture provides resizing capabilities (iPhone, Android, Unity editor)
-ScreenCapture is supported by Texture2D and can be directly uploaded to the server
-ScreenCapture is very simple
-ScreenCapture supports Android, IOS, etc.
ScreenCapture tutorial (English)
ScreenCapture tutorial (Korean)