File sharing in itunes

I can drag and drop files into shapr 3d in itunes. but when i have to import it in the Shapr 3D app on my iPad (9th Gen) it does not appear under the “on my ipad” under the locations tab in files. Please help asap. If you refer the image it shows that the .stp file has been copied onto shapr 3d but it dosent appear anywhere in Import > files> Locations>on my ipad