Allow Media MIME Type Uploads based on user role

mime_by_role.php

add_filter('upload_mimes', 'admin_upload_svg');

function admin_upload_svg ( $existing_mimes=array() ) {

	$user = wp_get_current_user();

  // If the user is an admin, add the svg mimetype to the list.

	if(in_array( 'administrator', (array) $user->roles )) {
		$existing_mimes['svg'] = 'mime/type';
	}

	return $existing_mimes;

}