How do i load 10 objects from a mongoose array multiple times and keep the previously loaded...

I basically have posts with an image and title. I want to load 10 posts initially. Then when you scroll down past them you can click a 'show more posts' button to load the next 10 and be able to keep doing that. So i dont know if its exactly like pagination because its all on one page and i want to keep the previous posts loaded. Im using angular and right now my app is working with a basic 'find' request which returns all the posts.

router.get(
"/",
asyncHandler(async (req, res) => {
const posts = await PostModel.find().sort({ createdAt: "descending" });
res.send(posts);
})
);

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