Autodesk support was able to figure this one out for me. Here is a paste of the steps.
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I was able to find out what is crashing the Layout Import process. You have a few rogue objects in model space that when removed permit the process to complete without crashing.
I opened your wetland file and did a bunch of typical testing, purge, audit, etc with no success. I then clean up model space with this workflow.
In model space zoom to the drawing extents.
Hit the CTRL and the A keys at the same time to select all objects in the drawing. Hold the SHIFT key down and use a crossing window to deselect all of the visible objects in the file.
In the Properties dialog or quick properties dialog use the dropdown arrow to note the objects that are not displayed but are in you file.
Hit the Delete key and save the file. Note at the command line you deleted 27 of the total 1553 objects that were in the drawing file.
After removing these objects I was able to import the page layouts without any issue.
Here is a video of the process.
https://autode.sk/3IJ7wcG
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after deleting the rouge objects the DC import layouts worked with no issue.