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When updating a gallery with a new image or deleting an image, is there a hook which gets called?

With a standard image field there's add_filter('acf/update_value/type=image', 'my_acf_update_value', 10, 3);

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You can use the same filter, just replace the type:

add_filter('acf/update_value/type=gallery', 'my_acf_update_value', 10, 3);

All fields extend the same base class, so they also share the same basic filters.

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