Can I delete imessages from only my iPad?
Can I delete and stop receiving iMessages on only my iPad, but keep them on my iPhone and MacBook? I don’t have enough storage space on my iPad.
iPad Air, iOS 12
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If your messages are configured to use iCloud Messages, deleting the message in one place will delete the message everywhere on your devices. (Deleting your copy will not delete the recipient’s copy, though.)
Not sure? See the setting Settings > Apple ID > iCloud > Messages
Use Messages in iCloud - Apple Support
If you’re not using iCloud Messages, enabling that can potentially save you some space on your device as the attachments are kept in iCloud.
If you are not using iCloud Messages and don’t want to enable that, then you should be able to delete messages locally and not effect your other copies. Try a few tests of other test messages locally first though, before you commit to deleting an important message,