Cannot connect to Roon Core on Synology DS920

I am a new user to ROON and not at all tech savvy.
I have installed spk version “20220216” onto a USB connected SSD on my NAS and have shared the folder on which my music is stored.
From my iPhone, ROON says it is searching my DS920 at the correct location
Within Shared Folders I have a folder USBShare1 and under Permissions, System Internal User, ROON is set up for read/write. This is the same for the music folder.
The USBShare1 folder shows up in my Network Folders on my PC as being connected - this is the same for the music folder.
Any advice would be appreciated.