After you install the software and open it, you will need to tell it to download/link your ancestry tree to create a file in FTM. It will download your tree in it's entirety, including all media.
The software can be set to sync manually (you tell it when) or to sync automatically (every time you open/close the program).
The software can be set to sync manually (you tell it when) or to sync automatically (every time you open/close the program).