1- file number 1 is etabs and is a substructure. base is Z=0 and top height is Z=19.3 m.
2- file number 2 is steel roof and its base column are in Z=20.
You should import file started with 1-- which is etabs to file number 2-- which is sap2000.
I tried to import and only shell did not import wich is file number started with 3--.
If you can add only that shell to file 3-- it will be ok.
program sap 14-2-4 and etab 2016 - 02 are availble with its necessary subfiles.