Free internet advice would be that you take professional advice from some experienced rcic immigration lawyer. It maybe a simple ask from IRCC and there are chances that resubmitting the requested documents with an explanation (LoE) might just be enough but at this point, you got to think in your best interest..as you don't want to lose all the time you spend so far waiting over something very simple.. Also, chances are that lawyer may advise something what you already know but it's worth knowing the same from someone who is legally experienced rather than taking the risk and repenting later..so proceed carefully. All the best!What should I do now? Do I attach an explanation of the document while uploading those?