Multisite doesn't allow me to upload files above 1500 kb!

Solution

This is just something that WP Multisite does by default.

You may change the file limits under "Settings"

The url to that page on your blog should look something like:

your-main-multisite-blog.com/wp-admin/network/settings.php

Look towards the bottom of the page under "upload settings"

 

 
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