The default SFTP file and folder umask permissions can be custom changed in the /etc/ssh/sshd_config file

 

Modify /etc/ssh/sshd_config and search for the line with sftp like the following

 

Subsystem sftp /usr/libexec/openssh/sftp-server

to

Subsystem sftp /usr/libexec/openssh/sftp-server -u 0022

and restart sshd with

/scripts/restartsrv_sshd