You can now use Mountpoint for Amazon S3 to create new files in Amazon S3. Mountpoint for Amazon S3 is a file client that translates local file system API calls to S3 object API calls like GET and PUT. It is ideal for workloads that read large datasets (terabytes to petabytes in size) and write sequentially to a file from a single process or thread. Common use cases include machine learning training as well as rendering and transcoding in media applications.
Source:: Amazon AWS