how to upload and share a file on ubuntu vps

Heya @driftinglightcyanurchin,

So after you are using v2ray, I would assume you are using Nginx as a reverse proxy. In that case in your Nginx configuration for your both mydomain.com and sub1.mydomain.com you can add the following Nginx block:

location /sub/ {
    alias /var/www/sub/;
    autoindex off;
    try_files $uri =404;

    add_header Content-Disposition "attachment; filename=$1";
}