I want to select a file from a datalist with Thymeleaf and Spring

This is my html file. I did a list with all my file from DB.

        File Name: 
        <input list="files" name="files" />
        <datalist id="files">
            <option th:each="file: ${files}" th:value=" ${file.fileName}"></option>
        </datalist>
        <button type="submit">OK</button>
    </form>
</div>

When I select a file I want to know what file I select. This is the controller. The File from post method is always empty...

@Autowired
public FileRepository fileRepository;

@GetMapping("/getFiles")
public String fileGet(Model model) {

    List<File> files = new ArrayList<>();

    files = fileRepository.findAll();

    model.addAttribute("files", files);

    model.addAttribute("file", new File());

    return "filesFromDB";
}

@PostMapping("/getFiles")
public String filePost(@ModelAttribute("file") File file, Model model) {

    model.addAttribute("fileName", file.getFileName());

    System.out.println("File: " + file.getFileName());

    return "resultFileDB";
}