External drive folder sharing issues

Hi all,

I'm hoping somebody can help me.

i have a Mac mini with a LaCie thunderbolt drive attached with all of my media stored.

My music library runs through a Sonos system which has worked perfectly for 5+ years.

Since the Catalina ‘upgrade’ my Sonos system cannot see my library at all. I have literally tried everything. All permissions are in place etc....

This is definitely an Apple issue rather than Sonos.

I wonder if anyone else has this issue and knows how to fix?

Thank you.