Taking a screenshot on the Huawei Mate 10 Pro and sharing it to other apps or contacts is easy. Here's how you do it:

1. Press and hold the power button and volume down button simultaneously.
2. Wait until you see the screenshot animation
3. You'll have about 2 seconds to choose between three options: Share the screenshot with an app or contact), Edit the screenshot by cropping or applying other effects, and Scrollshot where you can take a scrolling screenshot of an entire page or app.

If you wait too long, the screenshot will disappear but it will automatically be saved and you can find it inside your Gallery app.