Question about WeTek Core, Android & Kodi, 4K

That should be possible, I just wonder why they would want to do that. Synology apps are for touch screen devices (smart phone, tablet) and using them with a remote control might not be a great user experience. To watch photos/movies or listen to music on your Synology NAS with the Wetek, you only need to configure access to the NAS in Kodi or in the Wetek player.