Work on the map together with friends

Zitat von P.Wisnia

How exactly do teams work? Are the map files updated on an ongoing basis?

You can work on maps together via cloud services (like Mega or Google Could), teams are just allowing your friends to modify your map, but they need the source files. Also, working on a map at exactly the same time is not possible, so it should look like this:
Person A works on a map, saves, the cloud updates the modified files, then Person B can start the work, and vica versa.