The model can see exactly one thing: the text of this conversation. Not your files. Not your inbox. Not the company wiki. Not the chat you had with it yesterday. If it isn't in the conversation, it does not exist.
Technical people call this visible slice the context window. Think of it as the model's desk: whatever's on the desk, it works with brilliantly. Whatever's off the desk might as well be on the moon. Check what's actually on it.