Hi VanChat team,
I'm developing a specialized AI coaching chatbot for private real estate investors in the regulated German market. It will be trained on a large custom knowledge base of expert content and serve as an always-on practical coach (with strong educational disclaimers).
Would VanChat be suitable for this MVP? I'm particularly interested in:

custom knowledge base support for large document sets
user file uploads during conversations
seamless WhatsApp integration
conversation history (users viewing past chats)

Quick insights on feasibility would be greatly appreciated — thanks!