Fileupload feature is not working with Nginx and Nodejs combination in Ubntu droplet

Fileupload feature works on my NodeJs application running locally on my machine. But when i upload the app on Ubuntu droplet with Nginx, everything works but the fileupload. I have to say, i am very new to Nginx and may be i am missing something very simple. Here is the content of my /etc/nginx/sites-available/default file

   # HTTP — redirect all traffic to HTTPS
   server {
       listen 80;
       listen [::]:80 default_server ipv6only=on;
       return 301 https://$host$request_uri;
   }
   
   # HTTPS — proxy all requests to the Node app
   server {
       # Enable HTTP/2
       listen 443 ssl http2;
       listen [::]:443 ssl http2;
       server_name abcd.com;


    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass http://localhost:5000/;
        proxy_ssl_session_reuse off;
        proxy_set_header Host $http_host;
        proxy_cache_bypass $http_upgrade;
        proxy_redirect off;
    }
}