For wp_insert_attachment and wp_generate_attachment_metadata, change $file_name in the following way.
$file_name = $upload_dir['path'] . "https://wordpress.stackexchange.com/" . basename($file_name);
WordPress codex for both function ( here and here ) says- ‘ Use absolute path and not the URI of the file. The file MUST be on the uploads directory’ $_FILES['fileUpload'] just gives the name of the file , not the absolute path along with.
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