I was able to connect my Fire 8 HD to my Mavic Air. You have to download the install packages for Google Play, install Google Play, then get the DJI app from Google Play Store. Follow the instructions carefully as the multiple install packages MUST be installed in order, otherwise uninstall all and start all over. It would have been simple if we could just download the DJI install files and install locally. You can search for install instructions. I used these instructions:
Amazon’s Fire Tablet normally restricts you to the Amazon Appstore. But the Fire Tablet runs Fire OS, which is based on Android. You can install Google’s Play Store and gain access to every Android app, including Gmail, Chrome, Google Maps, Hangouts, and the over one million apps in Google Play.
www.howtogeek.com
You will also need to get some kind of holder for the tablet as it does not fit my controller. Amazon has dozens to choose from. Avoid a mount that blocks the antenna. Get a holder that positions the tablet above the controller, or in front and above/below the antennas. Note: Most come with a strap that mounts to the bottom of the controller (near your belly, not underneath) which helps hold everything up, but you have to keep it level yourself. Of course, you need to memorize all the controller controls if the table is above as they tablet will hide them.
Be sure to turn off all apps, including Alexa so they will not pop up during flights.
What is everybody else using for a mount to use a larger tablet format?