Size Limitation on kmz Files?

[Jeffrey_McNeal]

I am adding a number of kmz map tiles to a GroupLayer, but two of the kmz files won't display on the base map.  The only item of interest is the two kmz map chips are 34 and 36 meg, respectively.   In the debugger, I can see that the two files are loaded and I am not receiving an error.  As a second test, I am able to pull the kmz files into ArcGIS Pro and they display even though the map draw/redraw performance drops.

Is there a size limitation on processing files this big?  

[DanPatterson]

empty map.... no defined coordinate system.... add the kmz

does it load?

if so, then the data are in an unknown or improperly defined coordinate system for the group layer

[Jeffrey_McNeal]

Not an empty map.  Out of the 37 files, 35 display without issue.  I can see in the debugger that the two files are loaded.