// Allow all font files WordPress
add_filter( 'upload_mimes', function( $mimes ) {
    $mimes['woff']  = 'application/x-font-woff';
    $mimes['woff2'] = 'application/x-font-woff2';
    $mimes['ttf']   = 'application/x-font-ttf';
    $mimes['svg']   = 'image/svg+xml';
    $mimes['eot']   = 'application/vnd.ms-fontobject';

    return $mimes;
} );