FileUpload doesn't jumps in ChangeHandler

Hello together,

i would like to know why after selecting a directory, the onChange method isn't triggered?

Thank you very much for your help.

Code:

public class CenterPanel extends ScrollPanel {

    final FileUpload fileUpload = new FileUpload();

    public CenterPanel(final GoogleUploader gooUp) {
       
        fileUpload.getElement().setPropertyBoolean("webkitdirectory", true);
       

        Image upBack = new Image(Resources.INSTANCE.uploadBackground());
        this.getElement().setPropertyString("align", "left");

        upBack.addDoubleClickHandler(new DoubleClickHandler() {

            @Override
            public void onDoubleClick(DoubleClickEvent event) {
                // TODO Auto-generated method stub

               
                fileUpload.click();
            }
        });
       
        fileUpload.addChangeHandler(new ChangeHandler() {

            @Override
            public void onChange(ChangeEvent event) {
                // TODO Auto-generated method stub

                JavaScriptObject fileList = event.getNativeEvent().cast();

                gooUp.setFileList(getFiles(fileList));
            }
        });

        this.add(upBack);
        this.getElement().getStyle().setBackgroundColor("#DBDEE6");
        this.getElement().setAttribute("id", "idScrollPanel");
        this.setHeight("100%");
        this.setWidth("100%");

    }

    private native JsArray<File> getFiles(JavaScriptObject e) /*-{
        var files = e.target.files;
        return files;
    }-*/;
}

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