Update for those wondering about flying with China Eastern/Shanghai airlines with a Volare Elite Plus (in my case a free one from the status match campaign this summer). I was granted a free 23kg additional suitcase, lounge access at Gatwick and Pudong airports and fast track for security. I had to show my status on the app. They wouldn't accept a screenshot of my card at the Gatwick lounge. I will update again once I know if any airmiles got credited to my Volare for these flights. I'm not super-hopeful, but the lounge access and extra luggage are very valuable to me.