if(json!= null && json.containsKey(JsonKeys.caption.toString())) {
        request.add(JsonKeys.caption.toString(), json.getString(JsonKeys.caption.toString()));
    } else {
        **String caption = fileDisposition.getFileName();**
        if(caption == null) {
            log.warn("uploaded file name not found, defaulting to resource");
            caption = "resource";
        }
        request.add(JsonKeys.caption.toString(), caption);
    }