Why is the wrong file attached to the task in Bitrix24?

Question

Bitrix24

Uploading a file:

$file = CFile::MakeFileArray(
    $link,
    false,
    false,
    ''
);
$fileSave = CFile::SaveFile(
    $file,
    '/telegram',
    false,
    false
);

I get the ID of the uploaded file: I
$FILE_ID = $fileSave;
attach it to the task:

CModule::IncludeModule('tasks');
$oTaskItem = new CTaskItem(272794, 1433);
$rs = $oTaskItem->Update(
    array(
        "UF_TASK_WEBDAV_FILES" => array("$FILE_ID")
    ),
    array(
        "USER_ID" => 1433,
        "CHECK_RIGHTS_ON_FILES" => false
    )
);

But something incomprehensible is attached:

What could be wrong?
It seems that the file is attached with the wrong ID.