I am trying to use model builder to create a number of DEMs from LiDAR point clouds. To do so, I need to filter the point clouds for ground points only and then convert the points to raster. In the past, I have used the tool "LAS Dataset to Raster" but I am unable to set the filters through this tool. (I would have to go into the properties of each layer individually and set the filter which is not an option for the number of files I have). In searching other questions, I saw that the tool "Make LAS Dataset Layer" allows me to set the filters and combined with "LAS Dataset to Raster" I can set the filters and create the DEM through model builder (see this question and answer: How to specify LAS dataset filters in ArcMap ModelBuilder?).
My lingering issue is that I cannot get any of the iterators to work with lasd files. And when I try to connect the iterator to "Make LAS Dataset Layer", my only option is as a precondition. How do I connect this process to an iterator with lasd files?