docs: public WikiAttachment uploadAttachment(Object projectIdOrPath, File fileToUpload, String branch) throws GitLabApiException {
  
          URL url;
          try {
              url = getApiClient().getApiUrl("projects", getProjectIdOrPath(projectIdOrPath), "wikis", "attachments");
          } catch (IOException ioe) {
              throw new GitLabApiException(ioe);
          }
  
          GitLabApiForm formData = new GitLabApiForm().withParam("branch", branch);
          Response response = upload(Response.Status.CREATED, "file", fileToUpload, null, formData, url);
          return (response.readEntity(WikiAttachment.class));
      }