Root files have stopped being recognised on ext HDD

Sonarr version (exact version) 2.0.05338:
Mono version 6.6.0.161:
Mac OS Catalina:

After years of having no issues I updated to Catalina and this seems (not 100% sure tbh) to have caused an issue with my root files not being seem. I’m using a Mac mini and all downloaded episodes go into folders on external hard drives. Sonarr can see the hard drives but no folders within them. I’ve tried reinstalling etc but thats not worked. I’ve added new folders but again these aren’t seen. I’ve scoured the net for answers but I’m just completely confused. Any ideas?

Catalina changes how disk access works and you need to make some changes.