title: QnA Maker - Updating Knowledge Base
body: <p>My QnA Maker service is currently trained on an excel file I have uploaded. If I update my knowledge base via the QnA maker settings tab and upload a new version of this excel file (deleting the old one), will it overwrite the whole knowledge base? Or just change what I've edited/ added in the file?</p>
  
  <p><a href="https://i.stack.imgur.com/eeuD2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eeuD2.png" alt="Uploading new QnA file"></a></p>
  
  <p>Furthermore - Will I loose QnA pairs that are 'sitting' in the Train API (As it only pushes to the knowledge base after a number of users send similar feedback)?</p>