@toomanymatts It should work when powerline adapter in the closet is connected to the primary E4 node. It may or may not work if you connect powerline adapter directly to the router. These are tests...

@toomanymatts One more thing: you have two powerline adapters, one is in the bedroom. Where is second powerline adapter and what is it connected to? This part is not clear from your original post.

@toomanymatts 1. Can the Deco E4 actually use Ethernet backhaul via Powerline adapters, or is GPT simply wrong? Yes, it can. I tested that at my house, but with different brand of powerline adapters....

@absheikh If you use Synology NAS Media Server, try this: Go to Media Server > DMA Compatibility. Uncheck Restrict access to Media Server for newly detected UPnP/DLNA devices.

@screennamescree You can configure static IP addresses for your NAS drives by using Deco mesh functionality: https://www.tp-link.com/en/support/faq/1795/ As long as you have static IP configured on...

@rs1975 You need to configure Deco mesh to run in Access Point mode, this will fix the issue you describe. See https://community.tp-link.com/en/home/kb/detail/334