code: public void uploadContent(@NonNull final String folder, @NonNull final ContentData data, @Nullable Callback<ComapiResult<UploadContentResponse>> callback) {
          adapter.adapt(uploadContent(folder, data), callback);
      }
docs: Upload content data.
  
  @param folder   Folder name to put the file in.
  @param data     Content data.
  @param callback Callback with the details of uploaded content.