Retrieve existing Data and attachment from SharePoint List for submission? urgent need help

Hi

Anyone can help

I need to retrieve existing Data and attachment from SharePoint List that was submitted via MS form and flow to view as part of a form and then submit additional information into the same item list.

Eg: 

I have columns for current data inside SP list vendors, description , attachment quote which I need to call back to view and with it submit a new attachment for invoice column and approver column.  How to do it?