I’ll add some nuance here. You can implement append yourself in a clunk way. Create a new multipart upload for the file, copy its existing contents, create a ne

I’ll add some nuance here. You can implement append yourself in a clunk way. Create a new multipart upload for the file, copy its existing contents, create a new part appending what you need, and then complete the upload. Not as elegant / fast as GCS’s and there may be other subtleties, but it’s possible to simulate.