我试图使这个功能时，用户可以上传简历和他的形象。
然而，每当我试图同时发送两个到后端，我得到坏的请求错误400。我试图改变的东西，但我似乎不能弄清楚为什么它去400，当我上传图像，或简历，而评论了第一个，或后者，当单独完成它的工作正常。
下面是我的后端代码：

@Post('signup')
  @UseInterceptors(FileInterceptor('cv'), FileInterceptor('avatarImage'))
  async signUp(
    @Body() signupDto: SignupDto,
    @UploadedFile() cv: Express.Multer.File,
    @UploadedFile() avatarImage: Express.Multer.File,
  ): Promise<any> {
    if (!cv) {
      throw new Error('CV file is required.');
    }
    signupDto.cvFileName = cv.originalname;
    signupDto.cvFileBuffer = cv.buffer;

    signupDto.cv = await this.fileUploadService.uploadFileCv(
      signupDto.cvFileName,
      signupDto.cvFileBuffer,
    );

    if (!avatarImage) {
      throw new Error('Avatar Image is required');
    }

    signupDto.avatarImageName = avatarImage.originalname;
    signupDto.avatarImageFileBuffer = avatarImage.buffer;

    signupDto.avatarImage = await this.fileUploadService.uploadImage(
      signupDto.avatarImageName,
      signupDto.avatarImageFileBuffer,
    );
    
    return this.userService.createUser(signupDto);
}

我可以分开寄，但不能同时寄。此外，我还提供了获取逻辑片段。

const handleRegistration = async (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();

    const formData = new FormData();
    if (selectedCvFile.length > 0) {
      formData.append("cv", selectedCvFile[0] || "");
    }
    if (selectedImagesForAvatar.length > 0) {
      formData.append("avatarImage", selectedImagesForAvatar[0] || "");
    }
 
    formData.append("username", formState.username || "");
    formData.append("firstName", formState.firstName || "");
    formData.append("lastName", formState.lastName || "");
    formData.append("password", formState.password || "");
    formData.append("email", formState.email || "");
    formData.append("phoneNumber", formState.phoneNumber || "");
    formData.append("address", formState.address || "");
    formData.append("city", formState.city || "");
    formData.append("role", formState.role || ""); 
    dispatch({ type: "CLEAR_ALERTS" });
    try {
      const response = await fetch("http://localhost:3000/auth/signup", {
        method: "POST",
        body: formData,
      });

      const data = await response.json();

      if (response.ok) {
        dispatch({
          type: "SHOW_SUCCESS",
          payload: `You have registered correctly !`,
        });
        console.log(data);
        localStorage.setItem("token", data.accessToken);

      } else {
        dispatch({ type: "SHOW_ERROR", payload: response.statusText });
        console.error("Registration failed:", response.statusText, response);
        // Handle failed registration, e.g., show an error message
      }
    } catch (error) {
      console.error("Error during registration:", error);
      // Handle any other errors that may occur during registration
    }
  };

如果你知道我能做些什么来让它工作，请这样做：）
谢谢