Fwiw, transferring files from an unRaid array (so Linux) to ROCK drove me nuts because of SMB file naming issues. Rsync would fail to transfer some of the files, for whichever reason. The way I found around it was hooking up a windows box to get the copying done, and then prune issues with Roon and SongKong.
It made the whole experience much more painful than it should’ve been.