I am sorry to hear that this has been your experience even after trying the steps suggested by other community members. I'd suggest raising an error report through the Samsung Members application by following the steps below.
Lodging these reports if issues arise allows our Samsung Members team to review diagnostic data sent through. It is best to submit this within 2-3 minutes of the issue occurring.
Samsung Members (application) > Get help > Error reports
What is happening when you try, nothing or a message? If it is looking but not finding a second device or storage is the s7 on the same wi-fi network or internet connection? Try Googling (e.g. problem connecting Smart Thing) as you tend to get more answers than in Samsung Members but you may also find answers in the support advice in Samsung Members, look for Community at the bottom of your screen, look right and click on that link. It is a bit messy finding out how this web area works in order to make it show advice.
