It's not like your ReadyNAS.

Without reverting to Control:PC, I cannot remember any other way of importing files into Sooloos unless you still have a old working copy [so needs a legacy version of OSX] of Control:Mac lying around with the appropriate version of Sooloos. I cannot remember how many versions ago it disappeared from Sooloos. Unfortunately I do not think that an old copy of Control:Mac will work with newer versions of Sooloos as everything use to be lock stepped version wise and I doubt Meridian had the thought of breaking that artificial limitation with one last release of Control:Mac. But would love to be wrong on that.

However, not sure if the dBpoweramp method worked without the import through Control:Mac. Worth investigating.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).