Adding attachments from Lead to Account

I just noticed that while creating a new lead, when the lead is converted into an opportunity a new corresponding account is created. To add attachments to a lead we have to add attachments to the "Notes" after saving a lead. But how can make sure that when these attachments are uploaded on a lead, they reflect as well on the account once it is converted into an opportunity.   

I have a similar requirement which I wish to achieve, any suggestions are most welcomed.