Take Better Screenshots
Every phone can take a screenshot. Where it captures whatever is on the screen at any given moment. This is nothing new, however, the OnePlus 5T can take "expanded screenshots".
If you want to take a screenshot of an entire webpage, a long email, or a message, but don't want to take 2-3 screenshots this is how. You use the Expanded screenshot mode.
Simply press and hold power and volume down at the same time, hold, and let go. This takes a screenshot. However, you can then tap the rectangle icon near the bottom right of the screen. This scrolls down and instantly takes another screenshot for you. Tap again to scroll further down the page. It's a pretty nifty feature if you need to take lots of screenshots.