Long-term AI project, trouble uploading json

Hi everyone, I was working on a long-term project with ChatGPT until I found that it was having trouble remembering old conversations. I am trying to switch to Gemini and use a pay as you go plan. I want AI to be able to read and understand the entire chat hx seamlessly with each message that goes back and forth I exported my conversation from ChatGPT and am trying to build an app in AI studio where it can upload and read the file for understanding. It seems to be getting stuck when it tries to read the file. Sometimes I get a basic error message. Other times it says my quota has been reached (which isn’t actually the case).

Any ideas?