Answering my own question, if your looking to import into complex ACF fields from a CSV file, I’ve been fighting with WP All Import for 5 days with little luck. It might work great from XML, don’t know, haven’t tried it. My clients can’t write XML files. I do know that there are serious issues when importing with from a CSV. It may work eventually, but if you’re looking for an easy fix, this isn’t it.
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