@Carol Sharing code snippet

// Read the file into a byte array
byte[] fileBytes = Files.readAllBytes(filePath);

// Set headers
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

// Create the HTTP entity
HttpEntity<byte[]> entity = new HttpEntity<>(fileBytes, headers);

// Execute the PUT request
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<String> response = restTemplate.exchange(
    signedUrl,
    HttpMethod.PUT,
    entity,
    String.class
);

if (response.getStatusCode() == HttpStatus.OK) {
   return "Upload successful!";
} else {
   return "Upload failed: " + response.getStatusCode();
}