WordPress MU: Media File Upload Limit Stuck at 1MB
If you’re running WordPress in a Multi-User configuration, and the media file-upload limit shows up as 1MB, do the following to increase your file upload limit.
1. Verify what your PHP file upload limit setting on your server is first.
This can be done by uploading a php file with the following code:
<?php phpinfo(); ?>
Then just view this file on your server like so: http://www.yourdomain.com/yourfile.php
Look at the upload size setting. Lets say this is 8M (or 8 Megabytes).
Go to your WordPress MU dashboard Network Settings and change the setting from 1MB to whatever you like.
The upload size setting here cannot exceed your PHP upload setting on your server.
WordPress MU wants this figure in KB so take the number of MBs you want and multiply by 1024.