A new Schoology/PowerSchool integration enables instructors to take attendance in Schoology using PowerSchool attendance tools. The PowerSchool SIS Attendance app is not supported on the Schoology mobile apps. This feature only works on sections that are synced from PowerSchool to Schoology--manually created sections will not be supported.
Co-teachers must be added as Admins to the Schoology course, in addition to being a co-teacher on the section in PowerSchool, in order to take attendance.
For a walkthrough of taking attendance in Schoology, watch this video: https://youtu.be/8mHODPcgMw8