Thank you very much for raising this. We're working on improving chatbot design time experience which will make it easier to build conversation flow. There isn't however plan to introduce any kind of "upload" functionality which you've been mentioning during a call.
Thank you for sharing your idea here in the Pega Collaboration Center (PCC)!
I have submitted this idea on your behalf in our internal system for feature enhancements and updated your post with the associated FDBK-ID. You can take this ID to your Account Executive for next steps.