Amazon FireTV 4K -- VLC m.p. does not see subtitle files added to the same directory as the .mkv files

-Fire OS 6.2.8.1 -FireTV Home Version 6321001.1

-FireTV Device with VLC installed: FireTV 4K "puck" version (not the stick and not the cube)

-FireTV 4K's Network Connection - Wi-Fi with speed measured at 250 Mbps with Wi-Fi speed app (wireless AX3200)

-Connected to pre-amp/processor via HDMI

-Noticed this happening with 10-bit UHD/HDR 2160p content, but have not confirmed whether it happens with 1080p content

-Using VLC to access Local Network NAS drives for music and movies

-Using DLNA access to NAS drives to access the "Browse Folders" option and navigating subdirectories to get to the content I want to watch.

The VLC Android App does this properly, but the VLC FireTV app has a problem. The FireTV version never sees .srt files I drop in the same directory with the content. That leaves me only with the option to download subtitles for the content, but that usually has some fairly large timing problems with the closed captions lagging the video by 4 seconds or so. Would like the FireTV version of VLC to work as well as the Android version for this.