Hi @nickharambee,
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Can you also confirm where your media and the XML file is stored?
As a side note, you may be interested in using Focus in Roon, which is similar to the Smart Playlist functionality in Apple Music. This might be an easier way for your to browse this type of selection compared to a playlist.