Each "Page" in a Figma file is assigned a unique presentation URL by the Pitchdeck plugin, so updates made to the deck and re-uploaded within that page will update the presentation on that page's URL.

To have multiple URLs, creating a new "page" via the left hand column in Figma inside your file (or just creating a new Figma file) will create a brand new URL/password specific to that page once it's uploaded for the first time via the plugin.

Duplicating a Figma file will duplicate its URL/password. Note that "duplicating" a Figma file will also carry over its URL/password from the original once, so it's always best to create a blank one if you need a new URL. This lets you maintain a separate presentation deck per page within a Figma file (or just use entirely separate Figma files to do this). You can have an unlimited amount of presentation URLs this way.