How do we actually use this? I tried selecting 'ChatGPT 4o with canvas' from the model drop down, uploading a code file, and asking "can we look at this file,

How do we actually use this? I tried selecting 'ChatGPT 4o with canvas' from the model drop down, uploading a code file, and asking "can we look at this file, I want to edit it with you", but it doesn't show canvas features or buttons that the instructional video has i.e. the UI still looks identical to ChatGPT. EDIT: I asked "where are the canvas features" and boom - the UI completely changed what the instructional video has.