Editing custom field value in database table?

Hello and thank you for the plugin!
I’ve just installed it to see if it works with my ACF field group in wordpress backend, for what I’m trying to do. Unfortunately it doesn’t seem so.

I have a custom post type named ‘person’ with thousands of entries. I’ve created my new table successful via your plugin, but the table is still empty. I saved a page from my custom post type without modifying something. Nothing happens. Only when I edit a custom field and save the post, then the plugin generates an entry to the new table. That means, I have to find a way to transfer existing field values to the new table. I’ve got the plugin WP All Import, maybe it works with this plugin?

But the actual problem is this: On my website I’m usually working with scripts, to generate the entries in the table automatically. To test the plugin if it works, I opened the new table with phpMyAdmin, modified a value of a field and saved the table. Then I opened the corresponding page in wordpress backend to see, if the value has changed. Unfortunately nothing happened, the value is still the old one.
When I change the value in wordpress backend and save the post, the value in the database table is changing, too. But when I try to edit values in the opposite way directly in the database table, it doesn’t effect the wordpress backend and ACF.

Do you have an explanation for this problem? Thank you very much in advance!
Andreas