It is possible to preview & operate from smartphones, you can take pictures of 4K picture quality "GoPro HERO 3" real machine use review - GIGAZINE
Smart Remote Control for Action Cameras | GoPro
HERO9 Black Firmware Update Delivers New GoPro Remote Compatibility, Up to 30% Faster Content Transfer Speeds to Phones, Improved HyperSmooth 3.0 Cold Weather Performance, Slo-Mo Shortcut, External Mic Support and More
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GoPro teases new Smart Remote and Hero 9 Black firmware update with app upgrade | TechRadar
The Remote update page
GoPro Hero3 review: GoPro bets big on its Hero3 Black Edition - CNET