<Spring Boot file upload doesn't work (bad request...

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[user]

Spring Boot file upload doesn't work (bad request)
I'm trying to do a simple file upload via a Rest API created with Spring Boot and Kotlin. This is my code:
@RestController
@RequestMapping("/api")
class Controller {

@PostMapping("/upload")
fun handleFileUpload(@RequestParam("file") file: MultipartFile): ResponseEntity {
try {
file.transferTo(File("C:\\upload\\" + file.originalFilename))
}
catch (e: Exception) {
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build()...