@Ruflse Cutting it as you suggested worked :) Thanks sooo much, it's been driving me crazy for a few days now. I still don't understand why when I follow the tutorial it doesn't work however and why he seems to get the same result with just the two cuts - one along the edge I mentioned earlier and the vertical one around…
If you watch the video a little further you'll see he makes a direct cut down vertically. This lets the mesh lay out flat like a strip. He explains there isn't enough room for the inside UVs, and that's why when you try to unfold, the UVs freak out and try to fold in on themselves. Think of this like trying to flatten out…