Save the first draft in Part 1, the second one in Part 2 etc. The file is not saved in the student papers comparison database although your consert for it is asked. An originality report starts to generate right after submission, but it may take from few minutes up to several hours (24 h at maximum) to complete. You can resubmit in the same Part, if you wish to make corrections to your work based on the originality report before informing your supervisor about the submission. Note, that an originality report of a resubmission generates only after 24 hours. If you have got comments from your supervisor on the document, do not submit another version in the same Part any more as the comments would disappear by a resubmission. Submit the next version to the part 2 etc. See additional information about Turnitin submission. After you have submitted, email an URL of the page to your supervisor as the system doesn't send her/him an automatic notification about the submission.