docs: public CreateChannelRequest withInputAttachments(InputAttachment... inputAttachments) {
          if (this.inputAttachments == null) {
              setInputAttachments(new java.util.ArrayList<InputAttachment>(inputAttachments.length));
          }
          for (InputAttachment ele : inputAttachments) {
              this.inputAttachments.add(ele);
          }
          return this;
      }