There are a few ways to screenshot on the Galaxy S8. The first way is to use the screenshot tool that comes with the phone. To do this, you need to open the camera app and then select the screenshot option. After selecting this option, you will need to provide some basic information about your subject. For example, you can choose a location or an image that you want to take a screenshot of. After providing these details, you will need to wait for the phone to take your screenshot. Once it does, you can save it as a file or save it as a picture. The second way is to use the Volume Down button and then press and hold on your Galaxy S8 until you hear a sound like an alarm going off. This will activate the camera and allow you to take screenshots without having to worry about getting them published online or in any other way.