As of June 7, 2017, the Certify system does not accommodate the deletion of files. While we are working on a improvements to the document repository to assist you in managing your documents, it will be a few months before these features will be available in the system.
Until those features are available, we recommend managing your file versions by appending a version indicator to the file name (i.e. my_file_v2.pdf)
We apologize for any inconvenience and want you to know that we are always striving to improve all aspects of the Certify user experience.