Hi, I have 2 Fire Sticks. One is "lite" and the other is "4K". The FS lite finds my UPnP / DLNA media server and plays all my videos. The 4K finds the videos but won't play them. I uninstalled and reinstalled VLC and now it sees only one of my DLNA / UPnP servers and it sits on "loading ...." for ever. I put one video on it as a test.
The VLC version is 3.5.4
Edit: BTW, I also have several micros, a Roku and 3 smart TV's running VLC flawlessly. It's just the 4K Fire Stick that has this issue.