I fortunately got my assessment done at once without any document rejections, but have heard from multiple people that WES rejects documents without stating the exact reason. Also, when I registered for WES, I chose the normal postal delivery method, but I never received the hard copy of my evaluation certificate. On dropping them a query to at least share with me a receipt no, they replied they can't track it. I've to order a duplicate report now, choosing the courier delivery method.