Yes, teachers, staff, and admins can plus add students to an activity after the cutoff time, if they are “available”. A student is available if they have not been plus added by another teacher and are not scheduled in a higher priority activity for the same flex period.
Teachers and staff can plus add available students to activities for the current day (before and after the cutoff time) and future dates. They cannot plus add students to activities for past dates. Admins can simulate teachers or staff to plus add students for prior dates, if this is necessary to correct Flex attendance. (This can only be done from the “Student Attendance” screen, not from the “My Schedule” screen.)
For more information about the Plus Add functionality in Flex, please reference the “Priority Level Definition Guide” and other training resources located in the HELP section of the Flex system.