Won’t work – Quick Scan Pro - Barcode Scanner. Deal Finder. Money Saver. Review

Will not work with my iPhone 8+ all it is is a black background when scanning says it is not connected to my camera but I checked everything and it is but it don’t work need help badly thanks he is a poor at everything it will not get all the black screen I keep saying not connected to my camera everything is connected it is not letting me do anything it’s just blank totally black picture that’s all ladies please do something wicked this thanks
Review by Eightball nine ball player on Quick Scan Pro - Barcode Scanner. Deal Finder. Money Saver..