Offizieller Kommentar
The iPhone 6s is a bit old at this point. Read this:
https://support.dronesmadeeasy.com/hc/en-us/articles/6844673577364-Issues-Using-Older-iOS-Devices
The Virtual Stick controls required by the Mini 2 make it even harder to deal with.
You can't upload a mission why you are in the air.