This update adds another great new function: the curve line. When the ruler is active, tap the line button (under shape options on the left side) and choose curve. You can then create whatever curve you need by moving the control points that appear on your ruler. The curve line also works when the ruler is set to mask mode.
We’ve also been hard at work under the hood, tuning our drawing engine technology. This update contains significant performance improvements to make drawing feel even smoother and more responsive. If you use Flow for writing, you’ll notice it feels quicker than ever before.