How to add a file to a task in Bitrix?

Question

1C-Bitrix

Hey!
Found the following code for my purpose:

if (CModule::IncludeModule('disk') && CModule::IncludeModule('tasks')){
        $oTask = new CTaskItem($task_id, $user_id);
        $arFields = array(
            "UF_TASK_WEBDAV_FILES"   => array("n".$disk_file_id)
        );
        try
        {
            if ( ! $oTask->update($arFields) )
                throw new TasksException();
        }
        catch (TasksException $e)
        {
            print_r($e);
            return;
        }
    }

however, I did not quite understand what to substitute in the $disk_file_id variable.
Logically, this is the ID of the file in the system, but where will it come from if the file is only going to be downloaded?
Who will help you figure it out?
The downloaded file is not located on the local computer, but on the network at a specific path, there is only a link to it.

Answer 1

The file must be downloaded first.
There is an example in the documentation: https://dev.1c-bitrix.ru/api_help/tasks/classes/ct...

CModule::IncludeModule('tasks');

$storage = Bitrix\Disk\Driver::getInstance()->getStorageByUserId($USER_ID);
$folder = $storage->getFolderForUploadedFiles();
$arFile = CFile::MakeFileArray($_SERVER["DOCUMENT_ROOT"]."/upload/wlog.txt");
$file = $folder->uploadFile($arFile, array(
   'NAME' => $arFile["name"],
   'CREATED_BY' => $USER_ID
), array(), true);
$FILE_ID = $file->getId();

$oTaskItem = new CTaskItem($taskId, $userId);
$rs = $oTaskItem->Update(array("UF_TASK_WEBDAV_FILES" => Array("n$FILE_ID")));