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I have a file input from which I add a series of images to an array called var immaginiPost = . I then want to get all of these images and add them to Firebase Storage and then once these are uploaded get also the title and content of a post from other two text inputs and create a post on Firebase Database where I also uplaod every downloadUrl for each image. I have a problem where I need to wait that all images have been uploaded to Storage and all downlaodUrls have been added to the var immaginiDownloadURL = array before creating the post and I can't figure this out. Thank you in advance.

 //Here create a new post
function newPost() 
 var postsStorageRef = firebase.storage().ref().child('posts');
 var postDatabaseRef = firebase.database().ref().child('posts');
 var postKey = firebase.database().ref().child('posts').push().key;
 immaginiPost.forEach(function(file)
 let uploadTask = postsStorageRef.child(postKey).child(file.name).put(file);

 uploadTask.on('state_changed', function(snapshot)
 // Observe state change events such as progress, pause, and resume
 // Get task progress, including the number of bytes uploaded and the total number of bytes to be uploaded
 var progress = (snapshot.bytesTransferred / snapshot.totalBytes) * 100;
 console.log('Upload is ' + progress + '% done');
 switch (snapshot.state) 
 case firebase.storage.TaskState.PAUSED: // or 'paused'
 console.log('Upload is paused');
 break;
 case firebase.storage.TaskState.RUNNING: // or 'running'
 console.log('Upload is running');
 break;
 
 , function(error) 
 // Handle unsuccessful uploads
 console.log('Unsuccessful upload');
 , function() 
 // Handle successful uploads on complete
 // For instance, get the download URL: https://firebasestorage.googleapis.com/...
 uploadTask.snapshot.ref.getDownloadURL().then(function(downloadURL) 
 console.log('File available at', downloadURL);
 immaginiDownloadUrl.push(downloadURL);
 //Then create the post...
 //TODO: Think of how to add all the pictures and then at the end create the post
 );
 );
 );
;