Sounds like a model issue.
If you are using a default working actor say a marine or other standard unit, can you simply change the model of the marine or other standard unit to the igloo? If that doesn't work it's some incompatibility with the model itself and requires actual 3d editing of the model.
That is outside the scope of DATA and requires a modeler and the tools and programs needed to create and/or edit .m3 files.
0.944705882352941
Apparently you need to do some XML editing to do this.
https://www.sc2mapster.com/forums/development/ui-development/165360-activate-classic-text-crawl