The only app I’ve ever used with a camera was the Panasonic app on my GH5 for a shoot because it gave you full remote control of the settings/focus and monitori

The only app I’ve ever used with a camera was the Panasonic app on my GH5 for a shoot because it gave you full remote control of the settings/focus and monitoring (for free!) I find most apps for cameras are not necessary and often buggy but I get why some folks like them