1-Enable remote staging (with Public and Private Site pages variation).
2-Upload some PDF documents in staged site. Wait until thumbnails are created.
3-Publish to Remote live. Ensure documents exists in live site.
4-Upload other PDF documents. Wait (again) until thumbnails are created.
5-Publish to Remove Live. In the status progress bar you can see that the previous published documents are published again, instead of only new documents being published,