Hint:
If the authors fail to upload the final versions, you might want to exclude them from the next steps of your conference by changing the status of these contributions again.
First, create a new acceptance status (or copy the status "Rejected") here:
Overview => Settings => Manage Acceptance Status,
call it e.g. "Final Version Rejected" and choose for "Will contribution be presented?", "Enable Final Uploads", "Assign to Session" and "Visible on "Conference Agenda" page?" the option "No" (see image 1).
Then assign this new status to the submissions with missing final uploads:
Overview => Submissions & Reviews => Results of the Reviewing Procedure & Decision About Acceptance
in the column "Status". Click on "Show more filter options" and choose for the "Special Filter" the option "Only contributions with missing uploads" (see image 2).
During this step, make sure that these contributions are also withdrawn from sessions of the conference schedule. This can be done in the column "Session" on the right (see image 2).