Why do I have to log in each time to Ubuntu One Files?

Many users have asked us to provide app2sd feature, meaning that you can move the application to external storage. However, this has consequences due to Android OS limitations. If you move Ubuntu One Files to external storage, once the storage is mounted (say, via USB) or the phone is rebooted, the Ubuntu One Account is removed by Android from Account Manager. Thus, the app requires you to log in again each time. If you don't mind keeping Ubuntu One Files installed on internal storage, it is highly recommended to do so. Note, in case of installation on external storage, auto-upload background service will not start, so you should run the app at least once manually.