Tiledesk URL Redirects to port 8081 instead of Nginx

[securewebsite]

I am using TileDesk Docker version. I have configured host Nginx Configuration to use SSL Certificate but website goes to 8081 port it redirect to 8081 instead of staying at 443.

[securewebsite]

Here is nginx.conf file

map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}
server {
listen 80;
server_name td.plzhelp.org;
location / {
proxy_pass http://localhost:8081;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
}
}