Just searching for a solution to this same problem. The App always defaults back to auto capture when I go to a new scan. I'm using it on my iPhone, iPad and iPad pro and its the same on all. What happens is it starts scanning so quick that it's usually done the first scan before I'm ready so I go and change it to manual then delete the first scan and then start scanning manually!!!!! If scannable wasn't otherwise so good I'd use something else :-) I can't help but think there must be a way to default to manual and keep looking for it in settings, but can't find it.