Automatically update forked repo without using a local machine

Let’s say I want to fork a repo at https://github.com/user-ABC/project

If the project’s original author (user-ABC) updates the repo, how do I get the updates on my forked repo without deleting & re-creating the repo ?

Note: I am not having the repo on my local machine - I am directly connecting the repo to DigitalOcean’s App platform which just asks permission from GitHub to connect the repo to the app.

Is there some magic involved ?

I didn’t realize that GitHub now has Fetch Upstream in their UI - Syncing a fork - GitHub Docs