Click Synchronize (1) to open the sync window.
Here you will see all files in the different modules of your current project.
The blue symbols (2) indicate if you can upload your version to the cloud or download a newer version from the cloud. Do not worry about losing data when several people are working on the same file. APMS will ask you whether to create copies if a sync conflict should arise.
Check the sync boxes (3) of the files you want to synchronize and click Ok (4).
You can lock files to protect them from being changed by other users.
Just click the checkbox and sync again.
In case you want to sync a file only for certain users, you can select the visibility option.
First, choose file to sync. (1)
Then, check and uncheck the users that should have access to that item. (2)
And sync again.