Text Editor funktioniert nicht

This is a simple yet powerful text editor that let you browse and edit any kind of text on your device and on the cloud (including iCloud, Google Drive, Box and more). • You can subscribe to unlock dark mode and unlimited usage. • Subscription auto-renew at the end of current period, unless cancelled 24-hours in advance prior to the end of the current period.  Per Apple policy, no cancellation of the current subscription is allowed during active subscription period.  You may manage your subscription and turn off auto-renewal by going to your Account Settings after purchase.  The subscription fee is charged to your iTunes account at confirmation of purchase.  Once purchased, refunds will not be provided for any unused portion of the term.