code: public void setDropZoneElement(Element dropZone) {
  
          if (m_allowUploads && (dropZone != null) && (m_uploadDropZone == null)) {
              m_uploadDropZone = dropZone;
              initUploadZone(m_uploadDropZone);
              m_uploadDropZone.setTitle(
                  org.opencms.ade.upload.client.Messages.get().key(
                      org.opencms.ade.upload.client.Messages.GUI_UPLOAD_DRAG_AND_DROP_ENABLED_0));
              m_uploadDropZone.addClassName(I_CmsLayoutBundle.INSTANCE.galleryFieldCss().uploadDropZone());
          }
      }
docs: Sets the upload drop zone element.<p>
  
  @param dropZone the upload drop zone element