I recently upgraded from the Free plan to the Plus plan. Since the upgrade, I can no longer upload files in threads that I started before upgrading. However, file uploads work in newly created threads. Any assistance on resolving this issue would be greatly appreciated as I rely on this feature for…

I got a response from support that helped me fix the problem: You need to change the model for your migrated chats from “Chat GPT 4o Mini” to “Chat GPT 4o”. The mini version does not have the ability to attach files. GPT 4o does. It looks like 4o mini gets assigned to all chats created under the …

Issue after upgrading to Plus plan

ChatGPT Bugs

Jim_Jones June 4, 2025, 3:33am 6

This fix is no longer working. Thank you for posting your answer, glad your system is working.

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Issue after upgrading to Plus plan

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