Hi, i have realized most web sites and apps use S3 for file storage . For an Express MongoDB app, where does it fit in? Specifically in communication with MongoDB for references to S3?

In case the above question isn't clear, basically I want to know the part S3 plays in a typical Express + MongoDB backend?

IS THIS THE TYPICAL SETUP

s3.config();

api('/save', function(){
    var fileUrl;
    var file = request.data.file[0];
    s3.uploud(file)
        .then(function(url){
            fileUrl = url;
        })
    mongo.set({'file':fileUrl);
})