How to build a local PDF RAG solution with zero code 

No you can't. It's just an easy-to-use RAG solution with Open WebUI, off-the-shelf with no customisation. Have a look at their RAG code if you are interested. github.com/open-webui/open-webui/blob/2fa94956f4e500bf5c42263124c758d8613ee05e/backend/apps/rag/main.py#L328

Yeah seems like the Mac is not powerful enough.

Lol you are right. I was hoping to make a short video. Hopefully the timestamp helped!

docs.openwebui.com/tutorial/rag