Thanks for the way-back link. Some more interesting info on this. So far I've been discussing the home iMac, the machine that originally sourced the iCloud library. Consider a Jethro Tull CD of mine, ripped at 128kbps, that I want to replace with 256 but w/o re-ripping. I've been unable to do that. Everything I do that lets me re-download gives me back a 128 bit song file. According to Apple, this is a matched file, not an uploaded file.
Now, go to my work computer, logged into the same Apple ID. I can see my cloud library, all the songs, all the playlists, etc. Everything has a cloud icon next to it. So I download one of those Tull songs and voila, I get a 256 bit file.
This all seems very strange to me. There also seems to be no way to remove the song file from my iMac library w/o also removing the song from iCloud.
I have way too much stuff at 128 bit to re-rip all that stuff if I can just download the 256 file with relative ease. Most of my listening any more is Spotify, so physically re-ripping is also not worth the effort.
Thanks for any insight.