Node.js Image Upload & Resize to Amazon Web Services (S3)

Hello :) I need functionality allowing the following: 1) users upload image(s) to AWS S3 in various formats (e.g., max-width: 800px, max-width: 400px, max-width:150px) 2) each of the various image sizes should be stored with their file name changed to a random string (ideally the shortest possible length). For each different version either it is stored in a different and return the uploaded image url back to the script to then store into an array. I am currently using the blueimp-file-upload-expressjs NPM and the following tutorial: [login to view URL] I also came across the following resource that allows for creating what appear to be lambda and waterfall functions. This looks like the kind of functionality desired but not sure if overly complicated. [login to view URL] I am not sure what is better, storing images in different folders (large, medium, small, thumbnail), or storing images with different suffixes ([login to view URL], [login to view URL], img-small-png, [login to view URL]). Any advice on this would be greatly appreciated :)