How to get the value of a callback outside the upload function of the Vimeo class?

I'm very new to js and I'm learning Nestjs. I'm building an API to work with the Vimeo API using their Vimeo lib. To upload a video, the Vimeo class has a method called upload:

upload(
        file: string | File,
        params: object,
        completeCallback: UriCallback,
        progressCallback: ProgressCallback | undefined,
        errorCallback: ErrorCallback,
    ): void;
    upload(
        file: string | File,
        completeCallback: UriCallback,
        progressCallback: ProgressCallback | undefined,
        errorCallback: ErrorCallback,
    ): void;

On my service, I used it like:

async uploadVideo(@Body() video: UploadVideoDto): Promise<string> {
    let videoUri: string;
    this.client.upload(
      video.pathToFile,
      {
        name: video.name,
        description: video.description,
      },
      function (uri) {
        console.log(uri);
        videoUri = uri;
      },
      function (bytesUploaded, bytesTotal) {
        console.log(bytesUploaded, bytesTotal);
      },
      function (error) {
        throw new Error(error);
      },
    );
    return videoUri;
  }

The function (uri) { console.log(uri) } is the callback function when the upload finishes and it gives the uri that the video was uploaded to. I tried to get it on my controller, like this:

 @Post('/upload')
  async upload(@Body() video: UploadVideoDto) {
    await this.appService.uploadVideo(video).then(function (uri): void {
      console.log(uri);
    });
  }

The problem is that the console.log(uri) always prints undefined. How can I get that callback return from my service to my controller?

if uploadVideo should return a Promise that resolves to an string (the uri), it could be like this:

async uploadVideo(video: UploadVideoDto): Promise<string> {
  return new Promise<string>((resolve, reject) => {

    this.client.upload(
      video.pathToFile,
      {
        name: video.name,
        description: video.description,
      },
      function (uri) {
        resolve(uri)
      },
      function (bytesUploaded, bytesTotal) {
        console.log(bytesUploaded, bytesTotal);
      },
      function (error) {
        reject(error)
      },
    );

  })
}

Learn about JS async/await feature.