I found the api incredibly hard to use as someone who hasn't used swift or macOS API's before. Because of the way some of the code runs as a separate plugin from the main app, you can't really use traditional logging as a debug tool. There is also a lot of split state to be handled. You have to provide sync anchors and diffed tree updates to change the folder contents, which just aren't available with most backends.

I started on a program to mount a website resource directory on your computer using this api, but I gave up due to the restrictions of the api: https://github.com/mathiasgredal/Itslearning