Hi Damaris,

Turnitin's grading tools only allow numerical values within Turnitin's own rubrics and the final grade value field when looking at the individual submission.

The numerical value in the final grade field can be converted to a letter grade once it has passed over to Moodle - I found this article on the Moodle website which I hope helps. This is a similar process to converting numbers to letters in Turnitin's website version.

Students will continue to see the numerical value when looking at their submission in Turnitin. If you add the letter grade in the feedback box and then delete the numerical value, be wary that this will likely overwrite the grade being passed back to Moodle as 0, and the 0 would convert to a letter grade in Moodle (I'm guessing 0 is a fail, so we don't want that!) Instead, I would advise that you inform students about how numerical values convert to letter grades so that the process is transparent, and they understand the reason for the letter grade that they have been given in Moodle.

Comments cannot be downloaded as a CSV file.
Grades can be downloaded as a CSV. If using Moodle, it will depend on the Moodle integration type that your institution uses. If using LTI1.3, you'll be able to download grades from the assignment inbox or via the Analytics tab.
If viewing from the Turnitin website, grades can be downloaded by accessing the assignment inbox, then select "Grade Report" via the Download All button, or exported from the Gradebook.

I hope that helps!