About iTunes match
How do I download before my iTunes match expires? I have joined iTunes music.
iPhone XS Max
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See Identify cloud status icons in your music library on your Mac or PC - Apple Support. Download anything that shows as available to download. You might want to make a smart playlist with the rule Location is not on this computer to pick out all of the content that needs to be downloaded. In principle Apple Music should take over your existing iCloud Music Library created with iTunes Match and you shouldn't lose anything that is stored only in the cloud, but it is better to have at least one copy stored locally and ideally backed up.
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