Load last send page is a quick way to access the send page of the last document(s) sent. This is mostly used for repeated sends of the same PDF(s) for busy teams with a sizeable document library. Instead of scrolling through the existing templates, this functionality saves time in locating them.
Here is a quick demonstration of how to use it:
Another useful functionality is saved send pages / frozen workflows which allow you to save a pre-prepared send page containing information you frequently add to documents and share it with other users.