AWS: Sync WWW folder between multiple load balanced instances

I am new to AWS. I am trying to setup an EC2 web server. I got the server up and running, I made the AMI (which included the WWW folder), added the load balancer etc. I terminated the original instance.

I would now like to upload some files to the WWW folder, so that I can modify my website. However, I can not figure out how.

I assume that I was supposed to do something such as share the www folder between the instances.

Here are the problems that I am thinking of:

1. How to I use SFTP (winSCP) to connect to the WWW folder?
2. If I change the WWW folder on one instance, does the change propagate to the others?
3. If not, how do I create a shared WWW folder?
4. How do I modify apache to point to the shared WWW folder?

My setup:

• AWS VPC in N. Virginia
• AMI with current website data in /var/www/http folder
• Website is drupal based
• RDS storing drupal database
• phpmyadmin also in www folder, using to control RDS