Finally i found a solution to people who will experience this problem. Downloads/uploads for bigger files are impossible, 1gb+. Connection gets disconnected or is painfully slow. Well-known problem here and reddit threads. This problem appears on this container with reverse proxy tutorial and when u make reverse proxy with NginxProxyManager.   Add to nginx.config or virtual host config file in reverse proxy. Depends on your configuration.   client_max_body_size