Materials in mobile previews not showing

Just learned about swaping the preview to mobile.
As the game i was working on was intended to be one, I went ahead and did this.

My landscape layer of course no longer shows.

Just the standard default grid

I dont know why. I kept the materials pretty basic. Just the basics, used a constant where I could (about to start looking into channeling)

I dont know enough to even know where to begin. I know before I was getting weird results. And someone told me to change everything to wrap, which I did and fixed it in the normal previews. Which I dont understand at all why or anything.
Would appreciate a point in the direction. I would really like understanding as WHY/HOW etc. Especially since I dont want to have to ask every time. I would like to know what i can do to make these things work