Could you provide the exact response it gave you? I’m going to need the exact response (and potentially the prompt to GPT builder, if you used one) in order to better diagnose the issue.
So, if I’m understanding this correctly, you are trying to upload a document in it’s “knowledge” part, but it’s essentially refusing?
I’d be a little…skeptical about putting sensitive information (like contact information) directly into a custom GPT as part of it’s persistent knowledge. I would recommend building an Assistant instead. OpenAI recommends this as well. If the wrong person uses your CustomGPT from the GPT store (which will be accessible to everyone unless you keep it private), or even gets the link to your GPT to use, you’ve just exposed your entire customer’s and employee’s contact information to the world, all in one fell swoop.
It might have actually denied your document upload precisely because of this, but I won’t know unless I see it’s response.
This topic can show you just how easy it is to retrieve internal data from a custom GPT (and LLMs in general).