Telegram\Bot\Api::uploadFile PHP Method

    protected function uploadFile($endpoint, array $params = [])
    {
        $multipart_params = collect($params)->reject(function ($value) {
            return is_null($value);
        })->map(function ($contents, $name) {
            if (!is_resource($contents) && $this->isValidFileOrUrl($name, $contents)) {
                $contents = (new InputFile($contents))->open();
            }
            return ['name' => $name, 'contents' => $contents];
        })->values()->all();
        return $this->post($endpoint, $multipart_params, true);
    }