<?php
//Enable SVG upload
function smartwp_enable_svg_upload( $mimes ) {
  //Only allow SVG upload by admins
  if ( !current_user_can( 'administrator' ) ) {
    return $mimes;
  }
  $mimes['svg']  = 'image/svg+xml';
  $mimes['svgz'] = 'image/svg+xml';
  
  return $mimes;
}
add_filter('upload_mimes', 'smartwp_enable_svg_upload');