It is fascinating to think about how it functions under the hood, but to use files in ChatGPT builder and have them read them at hello you must tell gpt in instructions in creator what its knowledge is. I use an index doc to organize but you can just do it as a list IE read knowledge at first user prompt. Or you must direct it ie read knowledge and offer index. Or offer each doc as a choice. You can organize them in instructions and chat session same way. If you want it automated though you must have logic for it in instructions,
And this is the logic for automation
Sorry I was not clear in my first response?