The Vivo X300 Ultra is a powerful camera phone aimed at videographers

Chinese phonemaker Vivo has been pushing the limits of smartphone photography in the last few years. However, the availability of its phones — like last year’s X200 Ultra, with its beefy add-on telephoto — has been intermittent in the West. The company says the X300 Ultra its first global flagship launch, although there’s still no word on a US launch or pricing at the time of writing. Like the latest phones from Xiaomi and Oppo, Vivo is also obsessing over larger camera sensors, peripherals and...