No, when the right to work section asks you to upload your term dates we need to see the term dates of the whole year, not the CAS letter.
To find this you can google your university, 'term dates', and then the academic year you are in e.g. 2022/2023.
When uploading the picture, you need to ensure it has the url of the website and the university logo if appropriate.
Below is an example of what you need to upload.