Hi,
Kindly install both the plugins and activate at the same time.
https://wordpress.org/plugins/wp-ultimate-csv-importer/
https://wordpress.org/plugins/wp-ultimate-exporter/
Check inside the WP Ultimate CSV Importer plugin, you will be able to find the export option.
Hope it helps.
Thanks.
I went through all of that again only to discover that Advanced Custom Fields support isn’t native. This has consumed far too much of my time. I’m moving on.