Second step would be to have a way for the client to report an error. I’ve seen a number of systems where this isn’t the case — just looking at the server logs

Second step would be to have a way for the client to report an error. I’ve seen a number of systems where this isn’t the case — just looking at the server logs everything looks okay until a week later that client calls to say they haven’t gotten a file in a week and wondering if something is wrong.