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  • ACF will pick up on it if 1) the data in the database is the same and this needs to be a serialized array 2) the meta_key value is the same and 3) the acf field key entry exists in the database for the post.

    Let’s say the field name is “gallery” the database must have to entries for the post:

    post_id    meta_key    meta_value
    100        gallery     {SERIALIZED ARRAY}
    100        _gallery   field_123456789abcd