Adding convolver files to Roon with older Mac high Sierra

I will be wanting to add wav files into the convolver area of Roon dsp.
I see that I cannot do this from my new IPad Pro.
I have an older Mac that uses high Sierra 10.13? I cannot seem to connect to my Roon core from my Mac. Is the os too old for Roon?
I also have an old laptop win 7. Would that work.
Jeff, help!

High Sierra 10.13 is not too old, I use it and there is no such function that would not work with the latest Roon; by the way - my Roon Core OSX is even older.
The first - have you checked your network settings whether your Roon is pinging your Core and vice versa? Have you restarted Core and Roon.