Type of documents exchanged via IRIS

I would like to clarify, for what kind of documents exchange will be IRIS portal used. According to information from the webinar , the active email notification on the main milestone of the submission stays the same (start of the procedure, request for supplementary information, outcomes...).

The IRIS portal can be used to upload documents into IRIS whenever a submission is "open for edit" or "open to upload". For post-authorisation submission, at present the initial upload of documents remains via the Gateway and Repository.