I can’t import into Sorenson either. I can only “send to”.
Rather than importing into Sorenson, have you tried “sending to encoding”? If not, start in composer. In your bin, click on your timeline (and make sure that you have in/out points so that all ttracks are highlighted. Also make sure that your indicator is at the start of your time line.)
Okay, so to R click on your project and “sent to encoding”. Sorenson should appear as an option. Click on it. Sorenson should automatically open. Hope it works.