Typescript Promise file upload

Hi every one im trying to open a dialog window after every file is uploaded to a server. However the window is opening first before all the files are uploaded. Can someone please tell me what I am doing wrong?

public UploadAll() {

    this.doAsyncTask().then(() => 

    this.dialog.open(DialogOverviewExampleDialog, {
        height: '200px',
        width: '300px',
    }));
}

doAsyncTask() {

    var promise = new Promise((resolve, reject) => {
    this.fileUploads.forEach((fileUpload) => {
        fileUpload.upload();
        resolve();
    });
});
return promise;
}

The issue with your code is that you resolve the promise on first fileUpload and also you don't wait until upload finishes

public UploadAll() {

    this.doAsyncTask().then(() => 

    this.dialog.open(DialogOverviewExampleDialog, {
        height: '200px',
        width: '300px',
    }));
}

doAsyncTask() {

 return Promise((resolve, reject) => {
    const promises : Array<Promise> = [];
    this.fileUploads.forEach((fileUpload) => {
           promises.push(fileUpload.upload());
    });
    Promise.all(promises)
         .then(() => resolve())
         .catch((err) => reject(err));
  });
}