Comment by kampopat

Vertical scrolling isn't affected. A horizontal slide of your finger will activate it and then you can slide over any photo you want to select (horizontal, diagonal and vertical). Once you lift your finger you can scroll down as you normally would. We take into account the angle at which you're scrolling so it is possible to select say 3 photos in the same column by sliding your finger over the top one at an angle and then sliding down. Try it out if you have an iOS device.