What is byte array format for uploading to GCS?

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Java

Google

cloud

servlet

upload

The following code is from this link starting on line 85. I'm a beginner in Java and Google Cloud Storage. I understand all of it except for the second parameter, "file", that is to be the byte array format. If I have a video that is 100GB what would the byte array parameter be?

 * Uploads a given file to Google Cloud Storage.
 *
 * @param filePath The desired file path for the file to be uploaded. File path should be absolute path and should include folders, sub-folders, and file name
 * @param file The file to be uploaded in byte array format
 * @return true if the file has been successfully uploaded; false otherwise
 */
public boolean uploadFile(String filePath, byte[] file) {
    try {
        setDefaultStorageCredentials();
        storage.create(BlobInfo.newBuilder(bucketName, filePath).build(),
                new ByteArrayInputStream(file));
        return true;
    } catch (Exception e) {
        return false;
    }
}

What I have tried:

I have successfully uploaded a file with a Tomcat server using the Part interface and the method getParts(). I did this to understand the upload and download procedure. GCS recommends the above code by using Blobstore.