The data file created on PC is grayed-out and cannot be selected to import in the app. How can I import it?
The files in the form of TXT and CSV that are created in your PC can be imported. Files in the other forms such as Excel or Google Spread Sheet are grayed-out and you cannot import them in the app.
If you try to do the same way as below, you may try to select a file in Google Spread Sheet form. As the (6) step as below, first download the csv file converted from Google Spread Sheet to PC, and upload the csv from PC to Google Drive or any storage that you want to use for the app's import, then select the csv file you uploaded in the app's import screen.