Chinese smartphone maker Oppo is mounting a fresh challenge in the foldable handset market after launching the latest product in its Find N series, as the industry faces rising memory prices and anticipation builds around Apple’s foldable iPhone.Find N6, launched globally on Tuesday, featured upgraded hinge technology designed to make the crease on the foldable screen “virtually imperceptible”, according to the company.“While foldables offer the advantage of a larger display, the crease has...