I have to setup logs in sftp, I found out some link online and i made the following changes in sshd.conf
Subsystem sftp internal-sftp -l info
and after that i restarted sshd services.
still there is no detailed entry for file upload and delete, only opne connections and close connection
Feb 13 14:12:31 ip-172-31-51-97 systemd[1]: Created slice User Slice of ubuntu.
Feb 13 14:12:31 ip-172-31-51-97 systemd[1]: Starting User Manager for UID 1000...
Feb 13 14:12:31 ip-172-31-51-97 systemd[1]: Started Session 736 of user ubuntu.
Machine is an ubuntu 16 instance in Amazon