Create your CSV file with guest details as described here. Make sure you have mandatory columns First name, Last name, and Email address. In case you need a template spreadsheet you can download it here.
For Android devices you will be using Google Drive to load CSV file to the App. Open Google Drive in the browser or as a stand alone program on Mac or PC. Drop your guests CSV file to Google Drive, see screenshot below. Please make sure you are uploaded a file with *.csv extention (shown in blue).
Once your CSV file is uploaded, open Guest List Android App and hit Import from CSV button. You will be asked to login to Google Drive. Enter your Google Drive login/password and allow access to the Drive if prompted. After that select the file you just uploaded.
To see a complete import process on the Android device check the video below.