The video explains what agents and workflows are, then builds five core patterns from scratch — prompt chaining, routing, parallelization, orchestrator-workers, and evaluator-optimizer — demonstrating how Dify can bring each structure to life in practice.
nice video 
Excuse me, I’d like to ask a question. When invoking certain tools that return file types—like json2excel—inside an Agent React node, the agent.file field ends up empty. Have you ever tried calling a tool that generates a file from within an Agent and then successfully displayed that file in the chat interface?