Activating the extensionClick on Extensions in the top menu, then tick the box next to Dropbox, and then click on the Close button. This will cause the page to reload, and from now on you have access to Dropbox options to save and load your maps.
Saving a map to Dropbox
To save a map to Dropbox, or move an existing map to Dropbox, select File->Save As from the main menu, or click the storage type dropdown next to the top-right save button, then select Dropbox.
Authenticating with DropboxThe first time you try to save or load a map using Dropbox, MindMup will ask you to authenticate access to your Dropbox account. Press Authenticate when asked to launch a pop-up window from Dropbox.
The pop-up window should now close, and MindMup will continue with the operation that required authentication. If you tried to save a map, you should see that the top-right icon next to the Save button has now changed to Dropbox. This means that your map was successfully sent to Dropbox.
The authentication is then stored in your local browser session. MindMup will send data directly from your browser to Dropbox using HTTPS, and your maps will never pass through our servers. You should be able to see a MindMup subfolder in the Apps folder in your Dropbox account, and this is where you'll find all your maps.
Removing AuthenticationIf you ever want to cancel authentication given to MindMup, open your Dropbox account, go to your settings (click on your account info in the top-right corner) and then open the My Apps tab. You should see MindMup in the list, and just click on the X button on the right. This will revoke access to your folders, but will not delete the maps.
Loading a map from Dropbox
Please note that changed FreeMind files will be saved in MindMup format.