The dropships served as a means for the First Order to transport vehicles to combat zones. During the Battle of Crait in 34 ABY, at least three of these ships, which were housed on the mobile capital Supremacy, deployed First Order All Terrain Armored Transports and the [superlaser siege cannon]. Each of these craft had the capacity to transport six walkers.
These dropships made their initial appearance in the 2017 Star Wars film, specifically Star Wars: Episode VIII The Last Jedi.