On a multisite install, go to the Network Admin area and add the webm file extension to the allowed extensions list.
On a single-site install, add this to your wp-config.php file:
define('ALLOW_UNFILTERED_UPLOADS',true);
That will allow administrator level users to upload files without the file type restrictions.
The underlying problem is that webm hasn’t been added to the filetypes list that WP knows about.
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