Network Max Upload Size must have a limit set

I have added..
upload_max_filesize = 15000M; to a file in root user.ini
I have added
ini_set('upload_max_filesize', '15000M'); to wp-config
I have added upload_max_filesize = 15000M; to php.ini file in my root..
I have check server php.ini settings.. I have reset the upload size.. on every site successfully no problem..
But in network settings...there is a override.. set on that.. that I don't know how to fix..
I set
to 0.. and it works and the media uploader says, Max is 0kb..
But no matter how high I set that setting.. it never goes over 64MB.. can somebody please help.. thanks