Amazon Simple Storage Service (Amazon S3) is object storage built to store and retrieve any amount of data from web or mobile. Amazon S3 is designed to scale computing easier for developers. For starting, in the tutorial, JavaSampleApproach guide how to create a SpringBoot Amazon S3 application.
Upload files to Servlet containers, application need register a MultipartConfigElement class. But Spring Boot makes it more easy by automatically configure it. In How to upload MultipartFile with Spring Boot tutorial, JavaSampleApproach will guide you how to upload MultipartFile with Spring Boot.