there’s only 2 partitions there the “3rd” is empty space the you need to expand once you’re in the OS.
Here’s a link to my main image, It’s Raspberry Pis official image with some modifications to work with the uConsole and DevTerm.
Here’s a Ubuntu image if you don’t like standard Debian.
There’s also a bunch of other images I’ve made in the link in the posts. There’s also a few other images made by others but these are the ones I’ve made.