This with a caveat: works only for albums present in Apple Music. AND also correctly uploaded to Apple Music. And possibly completely totally different from anything at all in Apple Music, because a remix CD single will not work, and neither will live recordings unless present at AM already.
This is incorrect. I have a few albums from confidential enough Chinese bands which aren't available for streaming or for sale on Apple Music / iTunes (or any other online music service I have tried), and Apple Music does upload them and make them available across all my devices with no problem.
Works exactly in th same way as iTunes Match for me.
I am not saying there are no issues with incorrectly matched remixes (though this is not a problem I have personally encountered), but you are definitly incorrect in saying the album needs to be present in Apple Music. If it isn't iTunes will upload your own copy of the albums (which can be in MP3 or AAC, I don't think lossless is supported) to the cloud and make it available in your music library for streaming or download on all your device. I use this on a regular basis and it works well for me.
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