$result = $client->file->read([
// file fields to select
'id',
'name',
'url'
], [
// arguments for selecting files
'ids' => [123456789]
]);
$filepath = '/path/to/file.txt';
$updateId = 123456789;
$result = $client->file->addToUpdate($filepath, $updateId);
$filepath = '/path/to/file.txt';
$itemId = 123456789;
$columnId = 'files';
$result = $client->file->addToColumn($filepath, $itemId, $columnId);