Same issue with me, had a presentation on my CustomGPT model tomorrow, but this issue has killed me and everything about it. Really frustrating, and OpenAI still didn’t even acknowledge this issue, nor provide any response to my emails or complaints by many other developers out there. Waste of time, money, energy, and other resources.
The issue is also being discussed in this thread, no response from OpenAI yet: https://community.openai.com/t/gpt-suddenly-cant-read-files-in-its-knowledge-base