started ubuntu lightsail instance which creates the folders with hostusername:psaserv , My sftp create files ubuntu username. NOW BOTH CLASHING

I solved it.

1. Add ports in firewall. example Custom TCP 21 22 184.65.143.85 SSH TCP 22 Any IPv4 address

Lightsail browser SSH/RDP DNS (TCP) TCP 53 Any IPv4 address

HTTP TCP 80 Any IPv4 address

HTTPS TCP 443 Any IPv4 address

Custom TCP 8443 Any IPv4 address

Custom TCP 8447 Any IPv4 address

Custom TCP 49152 65535 Any IPv4 address

DNS (UDP) UDP 53 Any IPv4 address

========================= 2. Choose explicit FTP over TLS (filezilla) to get directory listing work. Otherwise i am not getting directory listing.

But when ever i change file in SSH i change user after all done chown -R plesk_site_ftp_username:psaserv httpdocs.