BookStack\Services\AttachmentService::updateFileOrderWithinPage PHP Method

    public function updateFileOrderWithinPage($attachmentList, $pageId)
    {
        foreach ($attachmentList as $index => $attachment) {
            Attachment::where('uploaded_to', '=', $pageId)->where('id', '=', $attachment['id'])->update(['order' => $index]);
        }
    }