Wordpress Allow Custom Font Upload

functions.php

<?php

/**
 * Allow fonts upload
 *
 * @param  array $mime_types Current allowed mime types.
 * @return array $mime_types Modified mime types.
 */
function allow_upload_fonts_mimes_types( $mime_types ) {
	$mime_types = array_merge(
		$mime_types,
		apply_filters(
			'fonts_mime_types',
			array(
				'otf'   => 'application/vnd.ms-opentype',
				'woff'  => 'application/x-font-woff',
				'woff2' => 'application/x-font-woff',
				'ttf'   => 'font/sfnt',
				'svg'   => 'image/svg+xml',
				'eot'   => 'application/vnd.ms-fontobject'
			)
		)
	);
	return $mime_types;
}
add_filter( 'upload_mimes', 'allow_upload_fonts_mimes_types' );