Update

core/bitrix/modules/ui/lib/FileUploader/TempFile.php

@@ -39,7 +39,6 @@ final class TempFile extends EO_TempFile
 			$chunk->setFile($newFile);
 		}
 
-		$tempFile = null;
 		if ($chunk->isOnlyOne())
 		{
 			// Cloud and local files are processed by CFile::SaveFile.

core/bitrix/modules/ui/lib/FileUploader/TempFileAgent.php

@@ -29,7 +29,7 @@ class TempFileAgent
 		$agentName = '\\' . __METHOD__ . '();';
 		$agents = \CAgent::getList(['ID' => 'DESC'], [
 			'MODULE_ID' => 'ui',
-			'NAME' => $agentName,
+			'=NAME' => $agentName,
 		]);
 
 		if ($agent = $agents->fetch())

core/bitrix/modules/ui/lib/FileUploader/TempFileTable.php

@@ -9,6 +9,7 @@ use Bitrix\Main\ORM\Fields;
 use Bitrix\Main\ORM\Fields\Relations\Reference;
 use Bitrix\Main\ORM\Query\Join;
 use Bitrix\Main\Type\DateTime;
+use Bitrix\Main\UuidGenerator;
 
 /**
  * Class TempFileTable
@@ -50,13 +51,7 @@ class TempFileTable extends Data\DataManager
 				->configureUnique(true)
 				->configureNullable(false)
 				->configureDefaultValue(static function () {
-					return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
-						mt_rand(0, 0xffff), mt_rand(0, 0xffff),
-						mt_rand(0, 0xffff),
-						mt_rand(0, 0x0fff) | 0x4000,
-						mt_rand(0, 0x3fff) | 0x8000,
-						mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
-					);
+					return UuidGenerator::generateV4();
 				})
 				->configureSize(36)
 			,