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Attach File Image to type field Drupal 9 Programmatically

I am using Drupal 9.3.13 on localhost. I generate successfully a QR Code based on the .SVG format and store that image on public://

I have created various field types, one of which is a Field type with a machine name: field_file_svg

The goal is to attach that existing Image that lives inside public:// and attach it to field_file_svg

I am using hook_entity_presave() for this. The QR Code is generated and stored successfully, but on node it displays nothing.

In /admin/reports/dblog/ it throws the following error.

Warning: Creating default object from empty value in urlist_entity_presave() (line 83

Here is my Source Code for this matter.

$qrcode = (new QRCode($options))->render("$output");        $file_data = file_get_contents($qrcode);       $file = file_save_data($file_data, 'public://t10.svg', FileSystemInterface::EXISTS_REPLACE);        if (!empty($file)) {          $file_arr = array(             "target_id" => $file->id(),             "alt" => "Alt1",             "title" => "Title1"         );                    $node->field_file_svg = $file_arr;
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Attach File Image to type field Drupal 9 Programmatically

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