What function can I use to override the multisite maximum file size upload restriction?
I have already maxed out the kb upload size and ensured that the max file upload size in php.ini is over 50mb, yet still I'm getting an error uploading an 11mb file.
upload_max_filesize
is what you expect it to be?post_max_size
to at least the same or greater. Check out the other precautions you should also take when doing so.