I'm not familiar with the unit you have, but in general, you need to share the files on your network so that other devices can access them through DLNA.
According to a quick search, it supports UPnP/DLNA. For Windows you can get a media server like Serviio for free and put it on the computer with the NAS where your music files are. Use Serviio to set up a share of your music files, then you should be able to use the Lightning app to play the files.
If your NAS is old, copying to a SSD or even just a fast spinning USB hard drive should work fine. It's probably not your NAS that's keeping you from listening though, it's more likely that your files aren't shared on the network.
According to a quick search, it supports UPnP/DLNA. For Windows you can get a media server like Serviio for free and put it on the computer with the NAS where your music files are. Use Serviio to set up a share of your music files, then you should be able to use the Lightning app to play the files.
If your NAS is old, copying to a SSD or even just a fast spinning USB hard drive should work fine. It's probably not your NAS that's keeping you from listening though, it's more likely that your files aren't shared on the network.