I just subscribed to the Pro and Plus of ToodleDo with a very high expectiation of attachment management with task. But to my disappointment, when you click on the icon for attachment, it cannot be previewable, you need to download the whole file in you application in order to see the contents of the file. That really slow down your task management. I am also using the iPhone and iPad versions which cannot integrated with attachment at all. It seems not much better than just linked your file with those free cloud storage apps, like Dropbox or Google Doc.