scan to 3d

I wanna do in scan to 3d but scan to 3d toolbar is nothighlighted when I import any "stl" file.
I dont know wheather problem with software or "stl" file.
Though we have Solidworks Professional but We subscribed forPremium for one month.
Let me know where I am wrong please.

ThanksSolidworksDrawings And Detailing