I've checked the description on the application's page at Google Play Store, but I didn't find anything related to importing. The only thing close to Import is the backup/restore to/from cloud feature. This allows you to send the files to the cloud and restore them later once the cloud account is connected in the application.
Typically, this feature should be found in the application's menu. Press the menu button while you are in the application or use the three points menu in the upper-right section and you can see all the available functions there.
For additional information, contact the developer using the following email: