Once the PDCO request for modification (RFM) is adopted, your case (procedure) enters "clock-stop" status and your submission will be "reopened for edit". This means that you can edit all the structured data in the portal webforms (prepopulated with the initial text/options) and upload new documents. Once you have completed your edits, and uploaded the relevant documents, you will have to re-submit the application using the same procedure as employed at initial submission. See Section 13 in:

IRIS guide to applicants (creation of submissions)

Please note that summary report with RFM will be shared with the applicants in the portal within 10 days of the plenary meeting, therefore the submission may re-open for edit before the report is available.