Inline references in Custom GPT using knowledge base

I am developing a custom GPT which can refer to uploaded documents. I want to ensure that the response provides citation to the document and page number. I have given following instructions as well:
It adjusts the depth of responses to user requests, emphasizing detailed analysis with transparent and specific inline citations and source links for each piece of information extracted from the documents. Additionally, it will now include the source of page numbers to assist users in locating information within the document.

However in the response, the citations get ommitted. please help.

Did you ever figure this out? I am curious myself.

Do we even have an official word on how knowledge search even works?

In my experience it is a dummy page by page search using regex and keywords from the prompt.

I am also looking for an answer. Did you figure out?