3D object imported for visibility assessment changes its shape

[AknurKarabay]

Hi! I am new to ArcGIS Pro. I am having problem with importing the obj format file from OpenStreetMap to ArcGIS for performing visibility assessment. I have downloaded the pppkx file and when open it I have the template file for visibility assessment but once I import to this file my obj the shape changes to circle as in the picture. Does anybody know what might be the problem? How to import a 3D object if the basemap is global map?Thank you!