Filling in a multiple property of the File type in infoblocks?

Question

1C-Bitrix

There is a form with a file selection field:

<input type="file" data-not-required name="file" multiple title="Изображения">

2 files (jpg,png images) are sent by POST method asynchronously ( enctype=multipart/form-data):

\CModule::IncludeModule("iblock");
$el = new \CIBlockElement;
if ($review_id = $el->Add( [
    'IBLOCK_SECTION_ID' => false,
    'IBLOCK_ID' => IBLOCK_content_reviews,
    'PROPERTY_VALUES' => [
"PICTURES" => $FILES['file'],
],
    'NAME' => 'test',
    'ACTIVE' => 'N', 
]))
    \AddMessage2Log(print_r($FILES['file'], true));

1C-Bitrix accepts and saves only one of the files as a property (similarly, var_dump contains only 1 array element, and arrays are not formed as values ​​for name, size, etc. as for several files):

Date: 2021-04-07 15:21:46
Module: 
Array
(
    [name] => Screenshot_1.png
    [type] => image/png
    [tmp_name] => /tmp/phpy1UseU
    [error] => 0
    [size] => 349258
)

array(5) {
  ["name"]=>
  string(27) "Без названия.png"
  ["type"]=>
  string(9) "image/png"
  ["tmp_name"]=>
  string(14) "/tmp/phpvX9khO"
  ["error"]=>
  int(0)
  ["size"]=>
  int(7308)
}

How can you catch both files and force 1C-Bitrix to write them to the multiple property of the file type?

UPD: regarding name="file[]" Bitrix ($el->LAST_ERROR) returns "Invalid file type" for any type allowed in the property (does it not know how to work with arrays?):

Although file types are explicitly defined for the property:

If disable validation of file types, the property is not filled at all (no files are attached). I understand that the question is more likely to support Bitrix for correcting the kernel / file loading module, but perhaps there are any faster solutions for modifying data valid for Bitrix?