You can upload files via AJAX in WordPress when they’re added to a multiple file input by using the jQuery Form Plugin and the WordPress AJAX API. Here’s a high-level overview of the steps you would need to follow:

  1. Enqueue the jQuery Form Plugin in your WordPress theme:
phpCopy codefunction my_scripts() {
    wp_enqueue_script( 'jquery-form', 'https://cdnjs.cloudflare.com/ajax/libs/jquery.form/4.3.0/jquery.form.min.js', array( 'jquery' ), '4.3.0', true );
}
add_action( 'wp_enqueue_scripts', 'my_scripts' );
  1. Add a multiple file input to your form:
pythonCopy code<form id="my-form">
    <input type="file" name="my_files[]" multiple>
    <input type="submit" value="Upload">
</form>
  1. Use the jQuery Form Plugin to submit the form and upload the files via AJAX:
javascriptCopy codejQuery( document ).ready( function( $ ) {
    $( '#my-form' ).submit( function( e ) {
        e.preventDefault();

        $( this ).ajaxSubmit({
            url: ajaxurl,
            type: 'post',
            data: {
                action: 'my_file_upload',
                security: my_ajax_nonce
            },
            success: function( response ) {
                console.log( response );
            }
        });
    });
});
  1. Process the file upload in the WordPress AJAX action:
phpCopy codefunction my_file_upload() {
    check_ajax_referer( 'my_ajax_nonce', 'security' );

    if ( isset( $_FILES['my_files'] ) ) {
        foreach ( $_FILES['my_files']['tmp_name'] as $key => $tmp_name ) {
            $file = array(
                'name'     => $_FILES['my_files']['name'][$key],
                'type'     => $_FILES['my_files']['type'][$key],
                'tmp_name' => $_FILES['my_files']['tmp_name'][$key],
                'error'    => $_FILES['my_files']['error'][$key],
                'size'     => $_FILES['my_files']['size'][$key]
            );

            $upload = wp_handle_upload( $file, array( 'test_form' => false ) );

            if ( ! isset( $upload['error'] ) && isset( $upload['file'] ) ) {
                $file_path = $upload['file'];
                // do something with the file
            }
        }
    }

    wp_die();
}
add_action( 'wp_ajax_my_file_upload', 'my_file_upload' );

Note: This is just a basic example to give you an idea of how to upload files via AJAX in WordPress when added to a multiple file input. You’ll need to modify the code to fit your specific

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