I uploaded 3 PDF documents in ChatGPT 4o, and began asking it about specific aspects discussed in these documents. I always use the same chat window, meaning it’s always the same session. I’ve noticed that in the following days, as I continue writing in the same window (session), at some point it seems like it no longer references the information contained in the uploaded documents. In fact, I copied a portion of text from one of the PDFs and asked if it could find it within the uploaded PDFs, but it couldn’t. I had to re-upload the same document to then receive confirmation that the text was found in that document.
The questions I wanted to ask are:
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Does this happen because I have exceeded the token limit for that session, causing it to start erasing older information to make room for new data?
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If I use GPT 4o with a longer context version, would I be able to have longer sessions and therefore “more memory”?
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If I use GPT 4o mini to upload documents within a session, theoretically allowing me to upload longer documents, and then later switch within the same session from GPT 4o mini to regular GPT 4o, could I leverage its greater cognitive ability while also saving tokens for that session, or does it not work that way?
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How can I solve this issue and avoid having to re-upload documents repeatedly to get consistent answers?