My Experience with Spring Boot and Angular

Hi everyone! I've been building a social blogging platform using Java on the backend and Angular on the frontend. One thing I've struggled with is implementing an efficient image upload and storage system for user blog posts. Handling multipart file uploads in Spring Boot while ensuring the Angular frontend provides a smooth progress bar for the user was trickier than expected, especially when trying to manage local storage paths versus cloud-based solutions like Cloudinary.
Has anyone else here combined these two recently? What's the best way to handle CORS and secure file uploads between them?