I am experimenting with adding layers from file in Illustrator. I teach a cartography class and we've been using M4CC to open AIX files exported from Pro. The map extent is of the San Juan Islands in Washington state. Now I want my students to add a KML file of the ferry lines after the map is exported. I clipped and projected the ferry data, hoping to speed up the import, before creating the KML. The AIX displays the correct extent in the Mapboard window, which is awesome. It also sees the larger extent of a location map that was also in the APRX layout. However the KML import (using "Add Content: Add Layer from file" in the Compilation window, then syncing) hits about 99% with the "Preparing layers, please be patient, we're still working" message just not disappearing. I've let it run for hours. Is this a bug, or am I doing something wrong? I can't find information on the web specific to this issue. Software used is ArcGIS Pro 2.8, Adobe Illustrator CC 2020, and M4CC 3.0.