4o capability using canvas

Hey there, ı do not know what you changed recently but chatgpt 4o is not able to create meaningful text based on the attached documents where you put certain parameters and asking it to put some creativity on top of it. It was great couple of weeks ago and now everytime ı try to d othe same ıt goes totally irrelevant of the documents and creates text totally independent. What happened recently ? What have you changed ? Pls revert back