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  • Some error on my response, this is a correct code:

    
    add_action( 'rest_insert_project', 'prefix_update_files_field', 10 , 3 );
    
    function prefix_update_files_field($post, $request, $true){
        global $wp_rest_additional_fields;
        $my_post_type = 'project';
        $additional_fields = $wp_rest_additional_fields[$my_post_type];
        foreach ( $additional_fields as $field_name => $field_options ) {
    
            if ( ! $field_options['update_callback'] ) {
                continue;
            }
            // Don't run the update callbacks if the data wasn't passed in the request.
            if ( !  isset($_FILES[ $field_name ] )  ) {
                continue;
            }
    
            $result = call_user_func( $field_options['update_callback'], $_FILES[ $field_name ], $object, $field_name, $request, $my_post_type );
    
            if ( is_wp_error( $result ) ) {
                return $result;
            }
        }
    }