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WordPress filter attachment_fields_to_save

  • Hi,

    I have created a custom field for attachment items using the attachment_fields_to_edit filter which works nicely in the ACF gallery and displays as I would expect.

    The issue is, saving of this field doesn’t seem to be handled by ACF as I would expect. It doesn’t actually hook onto the attachment_fields_to_save method.

    Hope you can add this feature/assist me with this 🙂

  • You need to use the edit_attachment action to save those custom fields.

    add_action( 'edit_attachment', 'my_save_attachment_location' );

    Just tested it and it works, wasn’t working with attachment_fields_to_save filter.

    function my_add_attachment_location_field( $form_fields, $post ) {
        $field_value = get_post_meta( $post->ID, 'location', true );
        $form_fields['location'] = array(
            'value' => $field_value ? $field_value : '',
            'label' => __( 'Location' ),
            'helps' => __( 'Set a location for this attachment' )
        return $form_fields;
    add_filter( 'attachment_fields_to_edit', 'my_add_attachment_location_field', 10, 2 );
    function my_save_attachment_location( $attachment_id ) {
        if ( isset( $_REQUEST['attachments'][$attachment_id]['location'] ) ) {
            $location = $_REQUEST['attachments'][$attachment_id]['location'];
            update_post_meta( $attachment_id, 'location', $location );
    add_action( 'edit_attachment', 'my_save_attachment_location' );


  • Perfect, does the job and also makes the attachment_fields_to_save hook redundant – thanks!

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