If you have many drawings you would like to import from Google Drive into Concepts on your Android device, here’s how you can do this:
Enable "Internal Storage" for Concepts. This FAQ explains how to do this.
Open your device's "My Files" app (or any file manager app you prefer).
Navigate to the "Documents" folder. Inside, you should see a folder named "Concepts."
Using your file manager, copy all of your drawings from their location in Google Drive and then open the Documents>Concepts folder and paste the drawings there.
Once this is complete, Open Concepts and you will see your drawings available in the app.