Once you have installed the Dropbox app, you can synchronise your Dropbox files and folders across all your devices. Sign in to your Dropbox account on each device, then add your files and folders to the Dropbox folder on your computer, phone, or tablet. Dropbox cloud file sync is available on multiple devices and platforms, from Windows and macOS, to mobile devices like iPhone, iPad, and Android via the Dropbox mobile app.
Newly saved or updated files/folders will be automatically synced everywhere, and you can tell when they are completely synced by looking for the green checkmark against files/folders in your Dropbox folder.
You can allow Dropbox to have different sync settings for different devices. See the Dropbox Help website for more information: