Configuring max POST size (post_max_size and upload_max_filesize)
Core-Admin starting from revision 5110, supports configuring easily the max POST size you can do to a given web size, known also as php settings “post_max_size” and el “upload_max_filesize”.
For that, get inside your Core-Admin panel as admin user, select a particular web site you want to update, and then click to “Site options”
If the option is not configured, it will be shown as “not configured”. Now, you only have to select it by clicking over it, then setup the required value (in megabytes MB) and then click on “Edit option”. With that you are done.