Please check your connectivity. We suggest having a WLAN or WiFi connection.
Afterwards you can use the materials offline.
It is also important that there is enough light for the camera to scan properly. You can turn up the brightness on your device or change from the outdoor to indoor mode.
In general: the more clearly you can see the pages, the better the scan will be.
You can select the pages and the respective contents manually. Click on the title displayed in the scan view at the bottom of the screen and select manual page selection. With one click on this, a list of all the pages on which there are extra contents will be listed. Select the page you want and the contents will be shown on your screen.