Allow Wordpress Media Library to upload SVG

extras.php

<?php
/**
 * Custom functions that act independently of the theme templates.
 *
 * Eventually, some of the functionality here could be replaced by core features.
 *
 * @package change_to_theme_name
 */

// @ Reference : https://css-tricks.com/snippets/wordpress/allow-svg-through-wordpress-media-uploader/

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