"An audio file is loading slowly."

[philr]

A common source of this problem seems to be having jumbo frames enabled on your network so that would be one thing to check. See this for more details.

No playback possible on ROON core on Synology and Bridge

Hi Mathew, how did you add your music folder in the storage settings (could you provide a screenshot of it)? This could also be a network related issue: A popular misconfiguration is having Jumbo frames activated. If they are enabled on your devices, please turn them off on all involved devices. Are there any firewalls active?