Why can't I see my scan in the mobile app?

Let's start by making sure there were no issues before getting to the Preview screen:

     1. Did you take at least 9 photos before submitting your sequence?

     2. Did you experience any wifi or cell service interruption while your sequence was being processed?

     3. Is your phone close to a surface?

If you tapped to preview your scan, but you're only seeing pieces of the scan or what looks like an outline of the scan: