My GPT doesn't analyze the full text, only the first 500 characters

I tried every prompt that i know, the beavior is always the same. It doesn’t matter how I tell it to read the entire file, it just refuses. What can I do? I need this for my job. Any suggestion?

Could you provide your custom instructions for it and how you’re asking?

The fact that it’s specifying specifically 500 characters in the code interpreter output suggests something is wrong with how/what you’re asking.