The WebM file format isn’t known to WordPress by default, you have to add it.
add_filter( 'upload_mimes', 'custom_mimes' );
function custom_mimes( $mimes ){
$mimes['webm'] = 'video/webm';
return $mimes;
}
The .ogg file format is known to WordPress as audio/ogg, if you’re wanting to do video with it, the correct extension is .ogv.
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