I have successfully loaded the sample data from auto3dgm into Slicer (see screenshot below). A common issue with these models is that the physical scale is unknown and/or reported incorrectly. Clearly these teeth are not only a few micron long, but that’s what the units are reported in. So you have the hit the “center FOV” button (red highlight) and zoom in quite a while for the models to be visible.
I suspect your data suffer from a similar problem. There is no special way to load PLY files, you can drag and drop them, and they will be listed in the Data module, if they are loaded (even though they may not be visible initially like this case). If there is indeed an error, you can hit CTRL+0 to open the application log and see what the error is.
