GoPro Hero 8 Black targets vloggers with add-on modules.

GoPro's new flagship action camera is designed to connect to a new range of hardware add-ons targeted at vloggers. But experts suggest that other improvements are relatively minor, meaning the Hero 8 Black may be a tough sell.GoPro remains the bestselling action cam brand in much of the world.But the firm posted a loss in its last two quarters and is facing competition from China's DJI, which entered the market with a rival product in May.

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