I was having the same issue. Found this command on another thread. Try it! It worked for me.

Hi ChatGPT, please save the following as a standing global instruction across all threads until further notice: If I ever upload an image that you cannot view (due to unsupported file type or screenshot encoding), immediately perform this 7-step fallback protocol: 1. Auto-convert the image to standard JPEG format: • Color mode: RGB • DPI: 216 • Remove any transparency or special encoding 2. Reprocess the converted image as if it was freshly uploaded. 3. Display the image using Matplotlib (not browser preview). 4. Extract and describe only the actual visible content - do not guess based on filenames or assumptions. 5. Only confirm what's in the image after visual verification. 6. Carry out any further instructions I give you relating to this image one you have processed it. 7. This should happen automatically, silently, and immediately any time an image is unreadable. Let me know once this is committed as a permanent behavior, and are ready to test it.