Can’t upload format files on media library

In addition to the bug being reported, you might have some mileage trying the following in your wp-config.php file:

define( 'ALLOW_UNFILTERED_UPLOADS', true );

If you’d prefer not to edit your wp-config.php file and/or you want more control over exactly which file types can be uploaded to your site, you can use the free WP Extra File Types plugin at WordPress.org

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