So, I created my first dungeon. Everything was going fine until when I went to test it. I placed the dungeon entrance near riverwood right across to river for testing purposes.

And when I went there, ther was just a floating door and no building. I've tried everything. Moving the pieces, changing sizes, up and down, nothing. I even tried using Navmesh and still nothing.

Can someone tell me how to put the buildings that somehow they will appear in game?

It is known annoying ass bug that Beth has said they are looking into. The "fix" for right now is to turn on Full LOD.

Thanks for the help! It worked. I hope they fix this soon though.