Got the answer to my problem after a little investigation.
The procedure to save a replay works in a different way using my old iPhone 5 instead of a fairly modern computer. That kind of underlines that it would be fair to change the rules of WGT (when it comes to tier advancing at least) for us that use a 4" display with a lot less functions than what those who play on a computer have.
That's at least my opinion after 4 months experience of playing WGT. I actually rather play on my iPhone than on a computer even if I had one that have the specs to play WGT in a descent manner which I don't and I certainly don't like jagged edges and playing in slow motion. So my vote is on the phone for now at least.
All The Best To The WGT Community,
Meo63