ChatGPT cannot read attached pdf

I have been using chatgpt to help me read papers for months. But today it just says that it cannot read the attached pdf. I have searched the forum and still cannot solve the problem. Does anyone know how to fix it?

I tried different models, including GPT-4 and 4o. They reply the same.

I can upload a blank image and then re-upload the file to read the paper normally. But I don’t know why it works this way. Maybe it’s a problem with the backend database?

Works for me with model GPT 4o using ChatGPT Windows Desktop App

Downloaded file https://arxiv.org/pdf/1409.4842
With ChatGPT used Attach file (paper clip icon)
Prompt: please read this pdf and summarize

Worked as expected.

I don’t plan to erase the share in the next few hours, after that no promises.

Same here. The crazy thing is that when I use a free version that I have access to, the file upload and reading works just fine. This free version has access to ChatGPT 4 for a limited time only.