Occasional Visitor

I am having an issue with adding Third Party Connected Services in Office, and have not been able to find any solutions through the forums or help topics or even Google.   I am hoping someone might be able to point me in the right direction!

The issue I am running into is when I go to connect a Third Party Service (Specifically I want to add Syncplicity), the only options that show under Storage are OneDrive and Onedrive for Business.  I know it can be done as I have seen it being used this way before, but I have not been able to figure out how to get it added.

Any help you can offer would be greatly appreciated!!