"You can send up to -2 files. Remove 2 to continue."

Hi and welcome to the community!

Just to double check, are you using the Free plan and have you uploaded any files (you write explicitly no upload files) or photos earlier before the error, including unsuccessful attempts?

According to OpenAI’s File Uploads FAQ, Free users are limited to 3 file uploads per day and the limit may be reduced during peak hours:

https://help.openai.com/en/articles/8555545-file-uploads-faq

This may therefore be related to the Free-tier upload limit.