Gabriel

the plugin mp3 jplayer does not have adequate support.

Its so simple.
Excuse me my ignorance. Thanks.

In time, this plugin is a really well programed, and works tremendously nice.

Well, you are using this plugin (imsanity)? It solves exactly this problem.

Portuguese
Bom, você está usando este plugin (imsanity)? Ele resolve exatamente este problema.

BR

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I verified everything, but not looks like wrong.
The image upload is done by two steps:
First the images are dynamically send to server by dropzone. The script is very simple. That works fine.

<?php
require_once($_SERVER['DOCUMENT_ROOT']."/test/site0/wp-load.php");

	if ( ! function_exists( 'wp_handle_upload' ) ) {
    require_once( ABSPATH . 'wp-admin/includes/file.php' );
}

if (!empty($_FILES)){

	$uploadedfile = $_FILES['file'];

$upload_overrides = array( 'test_form' => false );

$movefile = wp_handle_upload( $uploadedfile, $upload_overrides ); //put in wordpress default directory

if ( $movefile && !isset( $movefile['error'] ) ) {

				imsanity_handle_upload($movefile);  //plugin to resize image

    echo $movefile['url']; //response to front-side script
} else {
    /**
     * Error generated by _wp_handle_upload()
     * @see _wp_handle_upload() in wp-admin/includes/file.php
     */
    echo $movefile['error'];
}

	}
			?>

In front-end, a input field holds the images urls returned by script above, separated by commas.
When the formulary is submitted, those urls are processed by script I talked in first message. And that not work. Process the image, set the thumbnail but dont generate metadata.

In another version, I process just one image send directly to file in form action. This one works, but i need the first one.

$cont = 1;
            foreach ($_FILES['my_image_upload']['tmp_name'] as $key) {
              $title = ereg_replace("[^a-zA-Z0-9_]", "", strtr($_POST["vehicle_title"], "áàãâéêíóôõúüçÁÀÃÂÉÊÍÓÔÕÚÜÇ ", "aaaaeeiooouucAAAAEEIOOOUUC_"));
              $content = file_get_contents($_FILES['my_image_upload']['tmp_name'][$key]);
              $ext = strtolower(substr($_FILES['my_image_upload']['name'][$key],-4));
              $title = substr($title,0,30);
                                                             //short the title 30 chars
              $title = $title . ++$cont . $ext;
              //adicionar a extensão
              $upload_dir = wp_upload_dir();
              $aux = date('Y-m-d')."-".$title; //final title
                                           //add date to title
              $namae = $upload_dir['path']."/".$aux;       //mount path

              $file = fopen($namae,'x');
              fwrite($file,$content);
              fclose($file);
              //parameters for plugin Imsanity, thats resize image
              $params['type'] = image_type_to_mime_type(exif_imagetype($namae));
              $params['file'] = $namae;
              $params['url'] = $upload_dir['url']."/".$aux;

              imsanity_handle_upload($params); 

              $attachment = array(
               'guid' => $params['url'],
               'post_mime_type' => $params['type'],
               'post_title' => sanitize_file_name($aux),
               'post_content' => '',
               'post_status' => 'inherit'                );               

              $attach_id = wp_insert_attachment( $attachment, $params['file'], $pid );  

               //generate metadata
              require_once( ABSPATH . 'wp-admin/includes/image.php' );
              $attach_data = wp_generate_attachment_metadata( $attach_id, $params['file'] );
              wp_update_attachment_metadata( $attach_id, $attach_data );
              set_post_thumbnail( $pid, $attach_id );
                            }//END FOR EACH

Dropzone reference