Articles does not appear in the issue

Hi dear all. Please help.
I created an issue
With quick submit plugin I uploaded articles (PDF)- assigned to the issue, schedlued publication

Went back to issue, it shows there are 4 items in the issue, shows the table of content- all looks fine.

Press publish issue.

Issue is published, but empty.

What did I do wrong??

Thank you nice people :slight_smile: