Please upload Ironman New Zealand Bike Course. All bike courses for Ironman racing should be in ZWIFT
mmmm, I don’t think you get it on how how courses are constructed. There’s a bit more to it than just uploading a gps file. The scenery all needs to be done etc etc.
If this is what you want to ride you’re probably better off using Rouvy where well known rides can be ridden with a video playing. Your trainer responds to the terrain change and the video speed matches your bike speed.