I have written more than 60 custom GPT’s and am trying to move one of my ideas from a custom GPT to using the Assistant API so that I can build the concept into a web app. I am trying to reuse some documentation i created in order to give the Assistant a knowledge base much like I did with custom GPT’s. I have given clear instructions to NOT link to the documentation PDF and NOT to use citations but it still always references the actual pdf document and ALWAYS has references to it. No matter what I try to do it always has the citations. How do i use a knowledgebase with the Assistants API so that it wont do citations to its knowledge base file? thanks in advance for any advice.