Forge storage: How does it work?

I've been using Envoyer for several years and just switched everything over to Forge.

The storage directory in Envoyer made sense to me as it's outside the current directory. The storage directory in Forge is mixed in with everything else.

I don't see a lot of documentation on this (and there appears to be zero docs on the Forge site), and the Forge series on Laracasts doesn't cover this either, so I'm confused as to what I'm supposed to do.

How does the storage directory work in Forge? Meaning, when I deploy, what happens? Does the storage directory get overwritten by the storage directory in my repo? If so, how do I prevent that?

Do I create a symlink in my Deploy Script? Or do I have to create a symlink using the Commands section manually after each deployment?

Thanks for any insight and advice!