update nested child elements and upsert

[9MaMo1]

i'm trying to run this query but it doesn't work when element not exist and its message is :

Query:
$result = $this->where('_id', $param['brandId'])->where('projects._id', $param['_id'])->update(["projects.$.thumb" => $param['thumb'] ], ['upsert' => true]);

Or
$result = $this->raw(function($collection) use($param){
return $collection->updateOne(['_id' => $param['brandId'] , "projects" => ['$elemMatch'=>["_id"=>$param['_id']] ] ],
['$set' => ["projects.$.thumb" => $param['thumb'] ]],[ 'upsert' => true ,"new" => true ]);

Message:

{message: "The positional operator did not find the match needed from the query.",…}
message: "The positional operator did not find the match needed from the query."
exception: "MongoDB\Driver\Exception\BulkWriteException"
file: "C:\host\iBBi-Website4.1\vendor\mongodb\mongodb\src\Operation\Update.php"
line: 179
trace: [{file: "C:\host\iBBi-Website4.1\vendor\mongodb\mongodb\src\Operation\Update.php", line: 179,…},…]