UFO or Military over Panyu, China on June 8, 2017?

SUBMITTER DESCRIPTION: Hi, I clicked these images while staring at sky from my iphone 7 Plus. I clicked them on way from Panyu to Dongguan, Guangdong province, China. The object vanished quickly when I was changing phone setting to video mode. Earlier there were aeroplanes flying in same direction. So, I am very confident that this is not a aeroplane nor a drone. Advise me what is this as I am curious to know if its some UFO or something else. Thanks.

MUFON CASE: 84272

EVENT DATE: June 8, 2017