[support] Can not upload greater than 1MB file

Hi all, I have drupal 7 installation on AWS server. And I have set up upload_max_filesize = 32M in php.ini I have created cck file/ image field into my site with default maximum upload size i.e 32M. Still I am not able to upload any extension file above the 1M. Its really wired for me. Any suggestion/guide, what else I have to check to upload greater than 1M files. Thanks in advance.