You can upload or enter monthly attendance by following the below path

SIS --> Attendance --> Student Monthly Attendance --> Select Class, Section, Academic month, Status and hit "Get" --> Enter Monthly Attendance Manually/Upload Monthly Attendance

This will not give you the day wise attendance report, you will get total no of working days for the selected month and the total no of Present/Absent days

Note: You can not enter monthly attendance for the students who are admitted later than the selected month