3
Two things govern the total allowed value.
; Maximum allowed size for uploaded files.
upload_max_filesize = 10M
; Maximum size of POST data that PHP will accept.
post_max_size = 2M
If Max post size is NOT the same as MAX upload size you will never be able to upload anything more than that.
These sizes are governed via the preferences, but I do believe that when I had this module , admin could post any size as long as PHP permitted this.
You can change these sizes either via php.ini or .htaccess (if your hosting company permits of course)
Catz