What does it mean that ePapers can be replaced as often as we like?

What does it mean that ePapers can be replaced as often as we like?

Our service plans are limited to a certain number of slots. In the Basic plan, the previous publication is always replaced and only the newest one is readable, but you can update the publication as often as you like. The Starter plan comes with 6 slots and the Business plan with 50 slots by default. If your plan is full, you won’t be able to upload multiple PDFs, but you can free up a slot by deleting an old ePaper or you can upgrade your plan to increase the number of slots!