Where/how do I store/serve dependency apps on the local server

What I’m trying to do:
Run the anvil app server locally with dependency apps.

What I’ve tried and what’s not working:
I have cloned the dependency apps locally so that the main app folder and dependency app folders are in the same directory. Then when I run the app server, I use --dep-id dep_<id>=APP_NAME

But, all of the dependencies aren’t found when I run my app.