Just an update. I was finally able to connect from my laptop to the BMW M5 AP -- One has to choose the "Connect new device" to get to the next screen which instructs to "Enter WPS pin or WPA key". Only then that I was able to connect to the car's AP. Now the server name shows up on with 2 icons (film strip and note) which I guess indicates video and music. Going to the Multimedia screen, I can see the DLNA/Upnp server that I have running on the laptop which is PLEX. I could also browse the different media folders. I tried music and some videos but had no success in making them play. I guess, I have to do further tests. Hope this info will help others explore the DLNA/Upnp possibilities with the hotspot.