Increasing Maximum Attachment Size

In order to change the maximum attachment file size (in this example, to 256 megabytes), edit /etc/php5/apache2/php.ini and change the following lines to match:

post_max_size = 256M
upload_max_filesize = 256M

Next, in  MindTouch 2009, enter the Control Panel. Click on System Settings, and then Configuration. In the files/max-file-size row, click on Edit Key. Change the Configuration Value to "268435456" (which is the byte size of 256 megabytes), and click Edit Key.