This video teaches you how to set up and use the 4K Photo Burst for Panasonic GX85 GX80. This will also work for the 4K Photo Burst Start-Stop modes of the Lumix G85, Lumix G7, GH5, G85, and Lumix FZ300 cameras.
Here is some of the things that 4k photo mode can do on your GX85 / GX80 cameras:
30fps action bursts
Adjusting focus after the fact
Mode where the image burst starts before you press the shutter button so you are never just a second too late for the action
Taking video and 8MP photos at the same time
All these modes make it easy to capture the spur-of-the-moment in a 8-megapixel equivalent picture shot at 30 fps. All you have to do after shooting is is to pick up the frame you want in the camera.