docs: public BoxRequestsFile.DownloadAvatar getDownloadAvatarRequest(File target, String userId) throws IOException{
          if (!target.exists()){
              throw new FileNotFoundException();
          }
          BoxRequestsFile.DownloadAvatar request = new BoxRequestsFile.DownloadAvatar(userId, target, getAvatarDownloadUrl(userId), mSession)
                  .setAvatarType(BoxRequestsFile.DownloadAvatar.LARGE);
          return request;
      }