In addition to my reply to Joel, he's a little extra information to aid LuvMusic (that might be considering Sooloos).

I found this June 2022 topic Sooloos QNAP software that explores options.

Whilst a good system in it's time, I'd personally stay clear of Sooloos on QNAP now, I uninstalled it from my QNAP a long-time ago (when I switched to Roon), though I do have a MD600 / TwinStore combination should I ever feel nostalgic.

I've just checked my archive and believe Sooloos_2.467.qpkg together with QNAP Installation Guide (2015-12-01).pdf was the last version to be released.
In the PDF there is a QNAP image that references version 4.1.2 (2015/1/26) of QOS, if I was running that I'd want to be 100% sure the NAS was fully isolated by a firewall.

I think it's also worth mentioning that with Sooloos rather than just referencing the existing music files it imports them a creates a copy using "Sooloos" HASHed folder/file names, which can't practically be used by other streaming systems.

Regards,
Carl

861v6+ID40, HD621, 8000.2, 7200HC, 7200.2, SKYQ Silver, PS3, PDP-LX6090, QNAP TS870-Pro (8*6TB), Roon, iPadAir2.
[In Reserve] C15, MD600 (2*3TB), TwinStore RM (2*2TB)