When a Vendor submits a question using the Opportunity Q&A tool built into Bonfire you can respond within that same tool. The tool can be found under Messages and then clicking on Opportunity Q&A tab. As Project Owner, you will access to view all of the vendor questions, type responses, and send your responses from this tool. Buyers can even attach files and allow vendors to attach files in the Q&A as outlined on our How do I add an attachment to an Opportunity Q&A message? page.