Implementing Async/Await in Node/Express app - node.js

Question

I am running into a sync/async issue with my program and am having a hard time implementing async into my middleware. I have tried a few times and broken it a bunch, what would be a fairly simple way to implement async await?
Here is the route
router.post("/testmedia", uploadFiles, testMedia);
Here is the middleware
const uploadFiles = (req,res,next)=> {
let b2fileIDs = [];
let savedPhotoLinks = {};
upload(req,res,function(err){
req.files.forEach(function(image){
var b2accountId;
var b2authToken;
var b2uploadURL;
//console.log(image);
b2.authorize()
.then(function(auth){
b2accountId = auth.accountId;
b2authToken = auth.authorizationToken;
}).then(function(ret){
b2.getUploadUrl(process.env.B2BUCKET_ID)
}).then(function(cb){
b2uploadURL = cb.uploadUrl;
b2authToken = cb.authorizationToken;
}).then(function(cb){
b2.uploadFile({
uploadUrl: b2uploadURL,
uploadAuthToken: b2authToken,
filename: 'test',
data: image.buffer
}).then(function(cb){
var uploadLink = {link: cb.fileId};
b2fileIDs.push(uploadLink);
}).then(function(){
successFn(response){
console.log(b2fileIDs);
//Save ID's to DB here
}
}).catch((error) => {
console.log("This is an ERROR " + error );
});
})
console.log("1");
console.log('2');
})
console.log('3');
console.log(b2fileIDs);
})
console.log('4');
next();
};
The problem is that when I upload multiple files the async nature moves on without capturing the b2fileIDs line.