The only time you get to see Eadu in the films is during a scene in Star Wars - Rogue One where Cassian Andor, Jyn Erso and the rest of the rebels visit the planet to find Galen Erso and take him out. The scene is set at night and its raining heavily. The planet is a source of Kyber Crystals which are used by Jedi Knights and Sith Lords to create their lightsabres. The Empire has captured the planet because in addition to be the items used for lightsabres, they are also the fuel for the Death Star`s primary weapon, the item that destroys planets.
The planet is also the site of a battle between the Rebel Alliance and the Galactic Empire. The Rebel Alliance plan to take out the installation. The installation is the research area where Galen Erso works and is where he is killed in the X-Wing attack.