My scans are upside down, how can I fix that?

Some scans may be upside down. Although extremely rare, it happens when you hold your phone very flat, and as a consequence, Genius Scan doesn't know the document's orientation compared to the phone.

An easy fix is to tilt your phone 45 degrees towards you and then flatten it. The tilting towards you will let the phone know the correct orientation.

Tip: if your scans end up inverted anyway, it's easy to rotate them in edit mode.