In some cases we require to increase the max_upload_size limit to upload more than allocatred limit on the server. For that we need to add this code in any php file and upload it in the plugins directory. After that need to activate this plugin.
php_value upload_max_filesize 20M
php_value post_max_size 20M
php_value max_execution_time 200
php_value max_input_time 200