I have now transfeered a mission to my controller over writing the dummy waypoint mission. If I add a mission after using the controller does it void my Litchi mission I brought down prior??
For every new mission you create in the Mission Hub and want to transfer to your flying device (RC, phone or tablet), you first have to create a new Dummy mission on the flying device, unless you want to replace an existing mission.
In other words, you don’t transfer/copy a mission from the Hub to the flying device, you always replace an existing mission.
Just for my understanding, for every mission hub mission you create you have to have the same number of DJI dummy missions to write over ?
Not exactly. You can have as many missions saved in the hub as you wish. However, in order to transfer any of those missions to your flying device, you have to replace a mission already on your flying device. Whether that is a dummy mission or one you previous flew is up to you.