I recently created a project in chatgpt and uploaded some images to it. All subsequent attempts to display these images failed, on mobile and on desktop in the browser, with a variety of different error messages, despite the files being uploaded, labelled correctly and discoverable under /mnt/data by the assistant. After some testing I discovered that explicitly instructing the assistant to use PIL to show the images worked with no problem at all.
Adding this topic in case anyone else runs into this.