Mycloud and a kindle hd and hdx

Hi how do I connect my kindle hd and HDX to cloud the app does not seem to work

Hello there and welcome to the WD community.

Have you tried to check on the Store to see if this application’s is available for kindle fire? To mi understanding the kindle fire works with a specific store if you can check the store and verify if your tablet is compatible with the application. Although you an use a file explorer if the kindle has one available that can connect through your local network and access the unit.