ChatGPT Pretends Not to See Uploaded Files!

I need GPT to help me generate summaries of articles.
The prompts are divided into multiple steps, but I’ve noticed that ever since GPT-4o appeared, ChatGPT has consistently pretended not to see the file or simply told me it couldn’t read the file.

Previously, the same prompts ran smoothly.
I wonder if this is a known bug or just a simple case of GPT being lazy. :unamused: