When you write a paper in \(\LaTeX\) and your collaborators prefer to use Overleaf but you prefer to use local setup, then you can do it with the help of the git version control system. Overall, the process is the following. You create a local git repository and sync it to a remote git service of your choice. Then you create a project in Overleaf. In the project settings you can find the link which you add to your git setup as the second remote server.