Increase max upload file size in WordPress Multisite network?

I'm trying to increase the max file size for a WordPress multisite install (currently 1MB). I've tried a number of things to no avail. The things I've tried:

Adding these to my hosts php.ini file:

memory_limit = 300Mpost_max_size = 32Mupload_max_filesize = 32M

Adding these to the functions.php file in the theme:

@ini_set('upload_max_size' , '32M');@ini_set('post_max_size', '32M');@ini_set('max_execution_time', '300');

Adding these to the .htaccess file:

php_value upload_max_filesize 32Mphp_value post_max_size 32M

I even tried checking the wp-includes/default-constants.php.

Interestingly, I have another WordPress install (not multisite) on the same server that seems to work perfectly (max upload there is 32MB). Any ideas what to try next?

Thank you.