The field file exceeds its maximum permitted size of 1048576 bytes

The reason is that the file size that SpringBoot embedded tomcat can upload by default is 1M, and an error will be reported if it exceeds this.

spring:
  http:
    multipart:
      enabled: true 
      max -file- size: 30MB
      max -request-size: 30MB

package com.blog.springboot.config;

import javax.servlet.MultipartConfigElement;

import org.springframework.boot.web.servlet.MultipartConfigFactory;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;

@Configuration
public  class MulterFile {
     /**  
     * File upload configuration  
     * @return   
     */  
    @Bean  
    public MultipartConfigElement multipartConfigElement() {  
        MultipartConfigFactory factory = new MultipartConfigFactory();  
         // Maximum file size   
        factory.setMaxFileSize("30960KB"); // KB,MB   
        // / Set the total upload data size   
        factory.setMaxRequestSize("309600KB" );  
         return factory.createMultipartConfig() ;  
    }
}