The Groove mobile app is a web app meaning that it can be accessed from any mobile device right in your browser of choice.
To get to the app, simply type mobile.groovehq.com into your mobile browser.
Here you will see a login screen where you can enter your subdomain
“I am sure you realize that it took Thomas Edison many, many tries before he perfected the light bulb.”
and login credentials.
And that's it! Once you're logged in you will see your folder navigation and you can get to work.