PART-I of the UPSC application is submitted but not submitted PART-II

If only PART-I of the application is submitted without submitting PART-II, the application remains incomplete and candidature cannot be registered. The application is incomplete even in cases where the applicant has submitted PART-I and paid fee as well, but has not completed PART-II (i.e. failed to submit Centre, photograph, signature and photo ID card).