Once the reviews are complete, the chairs can enable the system for paper revision submissions.
First, go to Administration-->Submission--> Submission Settings to turn on the following options so that the system is re-opened for paper editing and the authors can upload a new revised file:
Then, the chairs can notify the authors to do the following:
Login to the system --> switch to the conference they are submitting papers to -->go to Submissions --> My Submissions and find the paper they have revised and click Edit --> upload the revised file, such as the following (one for the original submission and one for revised version).
Then, the chairs can see the revised versions in the All Submissions page.