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One additional user requirement, which has emerged from the replies so far (thanks to all) - moving files to a computer and then removing them from the phone is not a viable option for anything except a catastrophic data loss. All the chats and media *must* remain accessible via WhatsApp, which is why I bought an SD card in the first place, assuming that it would be simple enough to point WhatsApp to it for storage, similarly to the camera app, Spotify, etc.