Is it not possible to send both a request body and multipart file in the Spring Boot controller via Postman?

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Yes, it is possible to send both a request body and multipart file in the Spring Boot controller via Postman. You can use the "form-data" option in Postman to add key-value pairs for the request body, and also add a "file" type key to select the multipart file to upload. In your Spring Boot controller, you can receive the request body using the @RequestBody annotation and the multipart file using the @RequestParam annotation.