Hello!
Thank you for reporting the issue! It’s a known bug that will be fixed in next major release. For now, you can workaround it adding the following code to your configuration class:
@Autowired
private MultipartProperties multipartProperties;
@Bean
public MultipartConfigElement multipartConfigElement() {
return this.multipartProperties.createMultipartConfig();
}
Also, see FlowUI 1.5 + REST = broken upload (test project included)