To save your package to a cloud storage service (such as Dropbox, Google Drive, OneDrive, etc), click on the Save to Cloud button.
The button will change into a small animated circle as it gathers the settings into a file for publishing, then a new window will appear.
If this is the first time using this option, you will be given a list of cloud storage services to choose from.
Select whichever service you have an account for, and a new window will appear, prompting you to log in to connect it to the Ninja. The appearance of this window may differ depending on what service you select.
After you connect your account, it will appear in a list at the top of the window. You can then connect additional accounts if you wish.
Click on a connected account to open the storage directory - this is where any files and folders currently on the storage account will be shown.
You can also add new folders by clicking the button in the top right corner of the window.
If you want to switch to other connected accounts or add new ones, click on the drop down menu in the top left corner of the window. From here, you can quickly select your other connected accounts, or click on Accounts to go back to the initial window to choose a new service to connect.
Either way, once you're in a location or folder where you want to save the package, hit the blue Select button in the bottom right corner. The cloud window will close and the file will upload to the service.
After you save the package, you can still go back to previous sections of the Ninja to make more changes and save again - the files are not "wiped" from your browser until you press the Reset link.