Joplin server (self-hosted) and synced folders

How is the sync folder feature of Joplin server (self-hosted)?

I need to share a folder with lots of notes with a group of people, allowing them to edit and create notes on their own. In that case, I'd create an account for all of them.

Is that possible? I am self-hosting Joplin server on my Synology diskstation and it's accessible from outside of my home network.

Thanks.