What happens when I choose whether to sync the official roll call period for the day, or all rolls?
This occurs when the Attendance PxP setting to have
automatic sync to Attendance is
“Enabled”. When it is enabled, you can
select to have only the official attendance roll as the official roll for
the day. This determines
which rolls will be automatically sync when submitted or modified.
Syncing all rolls will use every submitted roll to automatically build up
an overall view of the students daily attendance based on their attendance
throughout the day.

Syncing just the official attendance roll will make
Attendance reflect the attendance data of that roll which will then have to
be modified within Attendance to reflect their actual attendance.
It is important to Read the details on screen under Automatic Sync to Overall Attendance.