I have used Genius Scan for a few years, trading news articles, comics, and photos with siblings and children across the U.S. Its an unusual app, so easy to use, so flexible, not burdened with "options."
Lately I havent been able to Send scans by email. So Ive reduced my use of Genius Scan. This may be due to a recent upgrade to iOS 10: The problem started right after I upgraded.
snowysix about Scanner App: Genius Scan, v4.0.10