Allowing SVG uploads in media uploader without plug-in

function cc_mime_types($mimes) {
  $mimes['svg'] = 'image/svg+xml'; 
  return $mimes;
}
add_filter('upload_mimes', 'cc_mime_types');

add in functions.php in your active theme

define('ALLOW_UNFILTERED_UPLOADS', true);

add in wp-config.php

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