I am setting up a ModelBuilder that iterates through a folder and creates a terrain from each shapefile (with an imported softclip). I can get through all the way building a terrain but the tool gets stuck on "Add Feature to Terrain". I know the problem is when I open the tool in ModelBuilder, it doesn't give me an option to add the feature classes inside geodatabase; it only allows me to add the shapefiles outside the geodatabase. It doesn't see the newly imported feature classes in the geodatabases and only sees the original shapefiles. How do I carry on to make the "Add Feature Class to Terrain" to be able to see these the feature classes instead of the shapefiles. I have attached a screenshot of my ModelBuilder.
Edit: This is being done in Pro, but can change to 10.5 if its a bug in Pro.